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Happy 31st to Nicole Richie — See Her Pose With Famous Friends!

Nicole Richie Pictures on Her Birthday

Happy 31st to Nicole Richie — See Her Pose With Famous Friends!

September 21, 2012 by Celebrity

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Nicole Richie turns 31 today! It's been an eventful year for her. In the last month alone, Nicole launched her Macy's line, hit up a star-studded wedding in Cabo San Lucas, and debuted her first fragrance. A busy schedule hasn't prevented Nicole from running with a fabulous group of friends, though. Over the years, she's kept the company of friends like Jessica Alba, Jennifer Lopez, and the Kardashians. Click through to see them all — and happy birthday Nicole!

Fox threw a bash in the Summer of 2003 to promote Nicole Richie and Paris Hilton's show The Simple Life as well as Jason Bateman's Arrested Development.

Naomi Campbell crossed paths with Nicole Richie in NYC during a September 2005 Fashion Week event.

Nicole Richie met up backstage with Fergie at the December 2003 Billboard Music Awards in Las Vegas.

Carmen Electra joined Nicole Richie at a May 2004 Art of Elysium event in Beverly Hills.

Mariah Carey joked around with Nicole Richie at a 2004 Halloween party in NYC.

Kelly Osbourne and Nicole Richie cozied up for a photo at a party celebrating Teen People's Young Hollywood issue in August 2004.

Diddy shared a hug with Nicole Richie during a September 2006 NYC Fashion Week charity event.

Nicole Richie and Christina Aguilera showed off their engagement rings during a February 2005 bash at Roberto Cavalli's Beverly Hills store.

Wilmer Valderrama stepped out to cheer on Nicole Richie at her June 2009 House of Harlow fashion show in Hollywood.

Rachel Zoe joined her pal Nicole Richie at a shopping event at LA's The Grove in July 2005.

Nicole Richie stopped to chat with Sophia Bush backstage at the 13th annual Race to Erase MS in May 2006.

Nicole Richie chatted with Rachel Bilson during a dinner held at LA's Sunset Tower in July 2006.

Marc Anthony and Jennifer Lopez met up with Nicole Richie and Joel Madden at L.A. Reid's post-Grammy dinner hosted by Jay-Z in January 2010.

Nicole Richie hung out with Ashley Greene during Ella Moss's LA 10-year anniversary celebration in July 2011.

Nicole Richie and Gwen Stefani posed for a photo during NYC's September 2005 Fashion Week.

Jay-Z and Nicole Richie were on hand for Marc Jacobs's September 2008 runway show in NYC.

Mary-Kate Olsen and Nicole Richie were both among the well-dressed stars at Proenza Schouler's September 2008 New York Fashion Week show.

Nicole Richie smiled for a photo next to Alicia Keys at Zac Posen's February 2009 New York Fashion Week presentation.

Lauren Conrad chatted with Nicole Richie during a UNICEF TAP Project fundraiser benefiting the Richie-Madden Children's Foundation in March 2009.

Nicole in Da House

Nicole Richie gave Maroon 5's Adam Levine a fist bump during a December 2009 Lakers game.

Nicole Richie and Hayden Panettiere attended Elton John's Oscars party in March 2012.

Kirsten Dunst met up with Nicole Richie in Beverly Hills at Art of Elysium's third annual black tie charity gala in January 2010.

Nicole Richie and Paris Hilton shared a hug at an LA party celebrating The Simple Life 2 in April 2004.

Nicole Richie joked around with Margherita Missoni and Kate Bosworth at Derek Blasberg's Beverly Hills book launch party in May 2010.

Rose McGowan posed side by side with Nicole Richie at the October 2010 CFDA Vogue Fashion Fund finalists celebration in LA.

Nicole Richie snapped a photo with Jessica Simpson at the 2003 Billboard Music Awards in Las Vegas.

Nicole Richie was escorted by Kanye West out of Jean Paul Gaultier's show in Paris in March 2011.

Nicole Richie and actress Emma Roberts stepped out to support Ashley Olsen and her line TEXTILE Elizabeth and James during an April 2011 viewing of the collection in Beverly Hills.

Nicole Richie was joined by her pal Jessica Alba at a West Hollywood Baby2Baby event in April 2011.

Nicole Richie and Lucy Hale attended the Dior Beauty Garden Party held at LA's Chateau Marmont in October 2011.

Nicole Richie, Amber Heard, and Jenna Dewan-Tatum met up at Elle's 18th Annual Women in Hollywood Tribute held at Beverly Hill's Four Seasons Hotel in October 2011.

Nicole Richie celebrated Lindsay Lohan's birthday in West Hollywood in October 2011.

Nicole Richie and Sharon Stone chatted at Macy's Glamorama event with Terry Chairman in LA in September.

Nicole Richie and Michelle Monaghan got together at the 40th annual FiFi Awards in May.

Nicole Richie, John Varvatos, and Elle Macpherson celebrated Fashion Star in NYC in March.

Nicole Richie and Andy Cohen hit the Bravo red carpet before kicking off season six of Watch What Happens Live in March.

Nicole Richie and Rashida Jones attended a pre-Grammys event in LA in February.

Nicole Richie and Joy Bryant goofed off at the NBC TCAs party in LA in January.

Nicole Richie showed support for Mindy Kaling in Hollywood at a toast for Mindy Kaling's book in November 2011.

Nicole Richie and Jessica Simpson stopped by the Fashion Star studios to visit finalist Nzimiro Oputa in August 2011.

Nicole Richie and Katharine McPhee linked up at the Golden Globes in January.

Nicole Richie and Kourtney Kardashian posed together during the T-Mobile Sidekick 3 Launch Party at The Paladium in Hollywood in June 2006.

Pregnant Nicole Richie and Joel Madden attended the launch of The Richie Madden Children's Foundation in LA in December 2007.

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