Rihanna arrives at her hotel with her hood up on Friday (September 7) in London, England.

The 24-year-old pop princess waved at the photogs as she headed inside.

PHOTOS: Check out the latest pics of Rihanna

Rihanna recently re-tweeted a sweet message from Lady Gaga about her performance at the VMAs: “What a lovely performance by @Rihanna! I feel like I’m sixteen again watching the VMAS, and then I remember I get to do this too. #socrazy.”

Earlier in the week, RiRi announced her upcoming world tour, Diamonds, and revealed several US tour dates!

Tickets will go on sale on Friday (September 14) at LiveNation.com.

Bar Refaeli makes an appearance on Late Night with Jimmy Fallon on Friday (September 7) in New York City.

“Oh wait, what does it say right there?! :)” Bar tweeted along with a pic of the cable lineup featuring her name. “About to go on @jimmyfallon :)”

PHOTOS: Check out the latest pics of Bar Refaeli

Bar appeared on the show to promote her cover for Maxim‘s September 2012 issue. Check it out in case you haven’t seen it yet!

10+ pictures inside of Bar Refaeli making an appearance on Late Night with Jimmy Fallon…

Adam Levine and his girlfriend Behati Prinsloo lunch at Mustard Seed Cafe on Friday (September 7) in Los Feliz, Calif.

The 33-year-old Maroon 5 frontman and Behati held hands as they walked back to their car.

PHOTOS: Check out the latest pics of Adam Levine

Earlier in the day, Adam tweeted his excitement for the new season of The Voice. He said, “It all begins again on Monday…@NBCTheVoice! In my not so humble opinion, the best season yet!”

A few weeks ago, the couple was spotted arriving at a hotel in Brazil for a Maroon 5 concert.

20+ pictures inside of Adam Levine and Behati Prinsloo holding hands in Los Feliz…

Lucy Hale is super cute at the Beverly Center’s 2012 Fashion’s Night Out event on Thursday (September 6) in Los Angeles.

The 23-year-old Pretty Little Liars star hosted the event alongside west coast Vogue editor Lisa Love and Kendall Jenner. Also at the event was Breaking Bad actor RJ Mitte!

PHOTOS: Check out the latest pics of Lucy Hale

Lucy rocked a pair of French Connection shorts, a Naven blazer, ShoeMint heels, and dalla nonna and Dana Rebecca Designs jewels.

10+ pictures inside of Lucy Hale hosting the Beverly Center’s Fashion’s Night Out alongside Lisa Love and Kendall Jenner…

Zachary Quinto takes the stage at the Shortlist Online Film Festival closing ceremony held at Sony Studios on Tuesday (September 4) in Los Angeles.

The 35-year-old actor was a juror at the festival, where he helped choose the “jury prize” short!

The prize was awarded to “Fishing Without Nets” by director Cutter Hodiern. Congrats, Cutter!

“stand up. take responsibility for shaping the country we live in. women’s rights. equal rights. human rights. all hang in the balance.” Zachary tweeted later in the week during the Democratic National Convention.

“registered to vote? know your polling place? arranged for an absentee ballot? answers to these questions will make all the difference.” he added.

Darren Criss and Lance Bass hit up Fashion’s Night Out at Saks Fifth Avenue on Thursday (September 6) in New York City.

The next day, the 25-year-old Glee actor, who also hit up GQ‘s Fashion Night Out party, jetted off to Toronto for the 2012 Toronto Film Festival!

“Ahhhh yeeea. In Toronto for TIFF- and I am one happy kid. Anybody coming to the IMOGENE screening today?” Darren tweeted.”Ok well if you DO happen to be in Toronto, I wanna be able to say hi to as many folks as possible before the screening…”

10+ pictures inside of Darren Criss and Lance Bass having fun for Fashion’s Night Out…

Minka Kelly grabs a smoothie at Great Earth Vitamins on Wednesday (September 5) in West Hollywood, Calif.

Minka recently tweeted her love for Michelle Obama by quoting the First Lady’s speech at the Democratic National Convention. “It’s not about how much money you make. It’s about the difference you make in people’s lives. #MichelleObama. I love her…”

PHOTOS: Check out the latest pics of Minka Kelly

Make sure to tune into the telecast for Stand Up to Cancer, airing Friday, September 7 at 8pm ET/PT on ABC, CBS, FOX, and NBC. Minka is scheduled to participate in the event, so don’t miss it!

20+ pictures inside of Minka Kelly grabbing a smoothie…

Peter Facinelli shows off his shirtless physique while vacationing with his adorable daughters Lola, Luca and Fiona on Wednesday (September 5) in Hawaii.

The day before, the 38-year-old actor and his daughters were spotted splashing around in the warm tropical waters.

PHOTOS: Check out the latest pics of Peter Facinelli

Earlier this year, Peter split from his wife of eleven years, Jennie Garth.

In case you missed it, check out these recently released stills from Peter‘s upcoming flick The Twilight Saga: Breaking Dawn – Part 2!

30+ pictures inside of Peter Facinelli and his daughters in Hawaii…

Mariah Carey and her husband Nick Cannon share a kiss on the red carpet at the 2012 BMI Urban Awards on Friday (September 7) in Los Angeles.

The 42-year-old singer was the BMI Icon honoree that evening for her “indelible influence on generations of music makers.”

Drake and Lil’ Wayne were named the Urban Songwriters of the Year and Nicki Minaj‘s song “Super Bass” was named the Urban Song of the Year.

Also pictured inside: Mariah arriving at LAX Airport the day before.

FYI: Mariah is wearing a Narciso Rodriguez dress, Christian Louboutin shoes, and Wilfredo Rosado jewels.

35+ pictures inside of Mariah Carey and Nick Cannon at the 2012 BMI Urban Awards…

Abbie Cornish, Colin Farrell, and Olga Kurylenko attend the premiere of their film Seven Psychopaths during the 2012 Toronto International Film Festival on Friday (September 7) at the Ryerson Theatre in Toronto, Canada.

The co-stars were joined by their castmates Woody Harrelson, Sam Rockwell, and Christopher Walken, as well as filmmaker Martin McDonagh, and producer Graham Broadbent.

Also pictured inside: Colin walking around New York City the day before.

FYI: Abbie is wearing a Giuilietta dress, Aldo shoes, Lorraine Schwartz jewelry, and a JustFab bag, which are all eco-friendly as she is vegan.

20+ pictured inside of the cast of Seven Psychopaths at the Toronto Film Festival…

Christina Hendricks is the woman in black for the premiere of her new flick Ginger & Rosa during the 2012 Toronto International Film Festival at The Elgin on Friday (September 7) in Toronto, Canada.

The 37-year-old actress was joined on the red carpet by her co-stars Alice Englert and Elle Fanning, who donned a bold suit.

PHOTOS: Check out the latest pics of Christina Hendricks

Earlier in the day, Elle was spotted at a portrait session for the film with Alice.

FYI: Christina is dressed in a Ports 1961 dress, Jimmy Choo shoes, Satori and Amrapali jewels. Elle is dressed from head to toe in Miu Miu.

20+ pictures of Christina Hendricks and Elle Fanning at the premiere of Ginger & Rosa at TIFF…

Chris Brown attends the Jenesse Back To School Fall Festival on Wednesday (September 5) in Los Angeles.

The night before, the 23-year-old singer looked stylish in a bright red jacket as he exited Supperclub in Hollywood.

PHOTOS: Check out the latest pics of Chris Brown

Over the weekend, Chris was spotted at the Kandy Vegas Labor Day weekend party in Las Vegas.

Chris is scheduled to appear at the 2012 MTV VMAs, airing tonight at 8pm ET/PT on MTV. Don’t miss it!

15+ pictures inside of Chris Brown at the Jenesse Back to School Festival and leaving a nightclub…

Sofia Vergara and Chelsea Handler pose on the red carpet at the 2012 Stand Up To Cancer telecast on Friday (September 7) at The Shrine Auditorium in Los Angeles.

The 40-year-old Modern Family actress was joined at the event by her co-stars Eric Stonestreet and Ty Burrell, as well as New Girl‘s Max Greenfield.

PHOTOS: Check out the latest pics of Sofia Vergara

JustJared.com recently chatted with Sofia about being nominated for an Emmy Award for the third year in a row and her partnership with Diet Pepsi. Check out the interview below!

25+ pictures inside of Sofia Vergara and Chelsea Handler at Stand Up To Cancer…

Amy Adams is elegant in a little black dress at the premiere of her upcoming film The Master during the 2012 Toronto International Film Festival at the Princess of Wales Theatre on Friday (September 7) in Toronto, Canada.

The 38-year-old actress was joined on the red carpet by her co-stars Ambyr Childers, Madisen Beaty, and Joaquin Phoenix, who brought a mystery gal.

PHOTOS: Check out the latest pics of Amy Adams

Joseph Gordon-Levitt also dropped by the premiere to watch the flick!

Earlier in the day, Amy was spotted arriving at Toronto’s Pearson International Airport.

FYI: Amy wore a Marchesa dress, Jimmy Choo shoes, Yosi Harari jeewels, and VBH bag.

30+ pictures of Amy Adams and her co-stars at The Master premiere at TIFF…

Alicia Keys belts out her song “Not Even A King” during the 2012 Stand Up To Cancer telecast on Friday (September 7) at The Shrine Auditorium in Los Angeles.

“I am proud2 StandUp2Cancer 2night with all of U! Join me & @SU2C 2NIGHT! I will B sharing1 of my favorite things with U live! ;-) #istandfor,” the 31-year-old singer tweeted that evening.

PHOTOS: Check out the latest pics of Alicia Keys

The evening before, Alicia performed her new song “Girl On Fire (Inferno)” at the 2012 MTV Video Music Awards with Nicki Minaj.

15+ pictures inside of Alicia Keys performing at Stand Up To Cancer…

Stacy Keibler, Jeremy Renner, and Minka Kelly attend the 2012 Stand Up To Cancer telecast on Friday (September 7) at The Shrine Auditorium in Los Angeles.

“What an inspiring night! Thank u for the chats!! So thankful for the @SU2C doctors and their amazing research. Donate @ su2c.org!” Minka tweeted.

Donations can still be made online to support the cause at www.su2c.org, via phone at 1-888-90-STAND (78263) or by texting STAND to 40202. 100% of all of the public donations go directly to cancer research.

Also in attendance: Jordana Brewster!

25+ pictures inside of Stacy Keibler and Minka Kelly at the Stand Up To Cancer telecast…

Justin Timberlake and fiancee Jessica Biel pose together backstage during the 2012 Stand Up To Cancer telecast on Friday (September 7) at The Shrine Auditorium in Los Angeles.

The 31-year-old entertainer and the 30-year-old actress were just two of many celebrities helping to raise money and awareness for various cancer charities.

Donations can still be made online to support the cause at www.su2c.org, via phone at 1-888-90-STAND (78263) or by texting STAND to 40202. 100% of all of the public donations go directly to cancer research.

10+ pictures inside of Justin Timberlake and Jessica Biel at the Stand Up To Cancer telecast…

Elle Fanning attends The Hollywood Reporter‘s TIFF Video Lounge during the 2012 Toronto Film Festival at Brassaii on Friday (September 7) in Toronto, Canada.

Earlier in the day, the 14-year-old actress attended the Guess Portrait Studio at Bell Lightbox, where she posed with her co-star Alice Englert from her upcoming film Gina & Rosa.

PHOTOS: Check out the latest pics of Elle Fanning

Check out the newly released trailer below for Elle‘s upcoming film Gina & Rosa, which will screen next at the New York Film Festival in October.

Also pictured inside: Elle‘s older sister Dakota Fanning sporting white in Soho on the same day.

15+ pictures inside of Elle Fanning at a portrait session in Toronto…

Alexander Skarsgard and Julianne Moore attend the premiere of their film What Maisie Knew during the 2012 Toronto International Film Festival on Friday (September 7) at Roy Thomson Hall in Toronto, Canada.

The film is about a young girl (Onata Aprile, pictured inside), who is caught in the middle of her parents’ (Steve Coogan and Moore) bitter divorce.

PHOTOS: Check out the latest pics of Alexander Skarsgard

Last weekend, Alex was spotted out and about at the Chateau Marmont.

FYI: Julianne is wearing an Alexander McQueen dress and Christian Louboutin shoes.

15+ pictures inside of Alexander Skarsgard and Julianne Moore at the premiere of What Maisie Knew…

Noomi Rapace is stunning at the premiere of her new film Passion during the 2012 Venice Film Festival at the Palazzo del Casino on Friday (September 7) in Venice, Italy.

The 32-year-old actress was joined by her director Brian de Palma on the red carpet.

PHOTOS: Check out the latest pics of Noomi Rapace

Earlier in the day, Noomi was suited up for the Passion photocall.

The day before, Noomi was spotted arriving in Venice for the Venice Film Festival.

Brian recently commented on the chemistry between Noomi and her co-star Rachel McAdam as “lightning in a bottle.” Noomi and Rachel met while filming Sherlock Holmes: A Game Of Shadows.

FYI: Noomi wore a BLK DNM suit, YSL shes, and Towe jewels at the photocall. For the premiere, Noomi is wearing a Valentino dress, YSL shoes, Bulgari jewels and clutch.

45+ pictures of Noomi Rapace promoting Passion in Venice…

Taylor Swift performs her new song “Ronan” during the 2012 Stand Up To Cancer telecast on Friday (September 7) at The Shrine Auditorium in Los Angeles.

The 22-year-old singer reportedly wrote the song for a 4-year-old boy named Ronan who passed away after a battle with cancer.

“Ronan” is now available for purchase on iTunes, with all proceeds going to cancer related charities.

Donations can still be made online at www.su2c.org, via phone at 1-888-90-STAND (78263) or by texting STAND to 40202. One hundred percent of all public donations go directly to cancer research.

Hailee Steinfeld is chic in the front row of the Rag & Bone Women’s Collection fashion show during Mercedes-Benz Fashion Week at Skylight Studio on Friday (September 7) in New York City.

During the show, the 15-year-old actress tweeted, “The @rag_bone show just 😍.”

PHOTOS: Check out the latest pics of Hailee Steinfeld

Maggie Gyllenhaal was also spotted at the Rag & Bone fashion show in an all-black ensemble.

Earlier in the day, Hailee donned a lacy dress at the Peter Som fashion show, joined by Allison Williams and Olivia Palermo.

10+ pictures of Hailee Steinberg and Maggie Gyllenhaal at the Rag & Bone fashion show…

Robert Pattinson poses with breast cancer survivor Pam Cromwell backstage at the 2012 Stand Up To Cancer telecast held at The Shrine Auditorium on Friday (September 7) in Los Angeles.

The 26-year-old actor, who presented during the show, attended the 2012 MTV Video Music Awards the night before with his Twilight co-stars.

Pam started Pink for Pam, a non-profit organization fighting breast cancer after she survived the disease in her 30s.

Donations can still be made online at www.su2c.org, via phone at 1-888-90-STAND (78263) or by texting STAND to 40202. One hundred percent of all public donations go directly to cancer research.

Gwyneth Paltrow poses on the red carpet at the 2012 Stand Up To Cancer telecast on Friday (September 7) held at The Shrine Auditorium in Los Angeles.

The 39-year-old actress served as the executive producer of the evening to help build public support for groundbreaking translational cancer research and accelerate the delivery of new therapies to patients.

Also pictured inside: Gwyneth‘s Country Strong co-star Tim McGraw performing during the show.

Donations can still be made online at www.su2c.org, via phone at 1-888-90-STAND (78263) or by texting STAND to 40202. One hundred percent of all public donations go directly to cancer research.

20+ pictures inside of Gwyneth Paltrow and Tim McGraw at the Stand Up To Cancer telecast…