Celebs Take Over the Catwalk

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Camilla Belle

Belissima! The actress rocked the runway when she modeled a beaded Alberta Ferretti gown during the 79th Pitti Immagine Uomo in Florence, Italy January 2010.

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Chris Brown

Sharp dressed man! The pop singer donned a tux for Naomi Campbell's Relief for Haiti show in February 2010.

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Hilary & Haylie Duff

Sexy sisters! Back in 2008, the Duff ladies participated in the Runway for Life Celebrity Fashion Show to raise money for St. Jude Children's Research Hospital.

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Ellen DeGeneres

Blue Steel! The talk show host walked the runway at the Richie Rich Spring 2011 fashion show in NYC's Lincoln Center.

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Jessica Simpson

Ooh la la! Wearing a ruffled black halter dress, the singer served as a special guest model at an Ozlem Suer show in Paris in 2009, which she filmed for an episode of The Price of Beauty.

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Kelly Osbourne

Strike a pose! The Fashion Police regular showed off a slimmer figure on the Relief for Haiti catwalk in Feb. 2010. Pre show she tweeted, "I'm so nervous I am walking in Naomi Campbell's runway show for Haiti tonight ahhhhhh so excited!"

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Kim Kardashian

Red hot! The reality TV star showed off her famous curves in a one-shoulder Marchesa gown at the Heart Truth Red Dress Collection show in February 2010. She even stopped to blow a kiss to then boyfriend Reggie Bush.

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Pam Anderson

It's C.J. Parker! The curvy star hit the runway for friend Richie Rich's A*MUSE collection in her iconic Baywatch bathing suit.

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Paris Hilton

Glamazon! Hilton opened the Spring 2007 Heatherette show lip-syncing to her own song,"Turn It Up" and wearing a chiffon gown.

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Ashton Kutcher

Blast from the past! The actor returned to his model roots (he used to pose for Calvin Klein), when he hit the runway during Sao Paulo Fashion Week this year. 

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Jwoww

Wow indeed! Jenni 'J-Woww' Farley strutted her stuff at Richie Rich's Fall 2011 show for Fashion Week in NYC.

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Kirstie Alley

The 61-year-old star closed the Zang Toi show at Mercedes-Benz Fashion Week in NYC Sept. 14. "Waaaa Hooooo! Kitty is ready to walk the Cat! False Bravado will guide me...Let's have some fun ZANG TOI!" the actress tweeted.

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Kendall Jenner

Part of the Kardashian family turned out to watch the 16-year-old make her runway debut during the Sherri Hill Spring 2012 presentation in NYC Sept. 15. "Must be emotional today bc when Kendall walked out on the runway I almost cried! I can't believe she's living her dream at such a young age," big sister Kim tweeted.

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Kylie Jenner

Kim's little sister hit the Avril Lavigne's Abbey Dawn runway during Mercedes-Benz Fashion Week Sept. 13. Big sis Kim was there to show her support, tweeting, "Just left Avril Lavigne's fashion show with my lil sis Kylie Jenner walking in it. She was so fab!"

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Kristin Cavallari

The star, who's expecting her first child with beau Jay Cutler, showed off her killer tanned figure in a blue glass bikini inspired by Miami Fashion Week sponsor Skyy Vodka on the Diesel runway July 15.