Beck, Justin Bieber, Joan Jett and Mark Ronson enjoyed the view from front and center.
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Moore, Please!
Demi Moore and her daughters, Scout and Tallulah Willis, sashayed down the carpet in rock 'n' roll getups.
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Bro!
Justin Bieber went in for a big bear hug with Lady Gaga, who modeled a Saint Laurent ensemble and wild blonde curls.
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The O.G. Squad
The classics — Lenny Kravitz, Jane Fonda and Sylvester Stallone — turned it out for the occasion.
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Kiss and Tell
Courtney Love planted a smooch on Lenny Kravitz's cheek.
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Lovely Ladies
Zoe Kravitz, Lisa Bonet and Demi Moore chatted at the show, which celebrated the 50th anniversary of Saint Laurent Rive Gauche, the label's ready-to-wear line.
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How's the Weather Up There?
Courtney Love towered over the petite Lady Gaga (she's only 5-foot-1!) while the pair hugged it out.
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Sister, Sister
Dakota and Elle Fanning, who shared a bench in the front row, could not contain their excitement.
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Legendary
Justin Bieber and Lenny Kravitz appeared to have a heart-to-heart while waiting for the show to start.
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Family Affair
Pamela Anderson was escorted down the black carpet by her sons, Brandon and Dylan Lee.
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Baes
Zac Efron and his girlfriend, Sami Miro, brought more pretty to the party in their all-black ensembles.
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Girl Talk
Jessica Alba and Rosie Huntington-Whiteley chatted while modeling shimmering designs.
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Say Cheese!
Director Lee Daniels and Lady Gaga played paparazzi with their camera phones.
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Blonde Ambition
A platinum-haired Justin Bieber greeted Courtney Love inside the Hollywood Palladium, where the show was held.
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New Friends?
Lily Collins (in a golden Saint Laurent mini) and Patrick Schwarzenegger got cozy before the lights went down.
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The Bee's Knees
Ellen DeGeneres held on to her wife, Portia de Rossi, and Sam Smith.
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A Little Loud?
Tobey Maguire brought his whole family to the show, including his 9-year-old daughter, Ruby, who covered her ears.
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Reunited and It Feels So Good
Zoe Kravitz posed with her parents, Lisa Bonet and Lenny Kravitz, and musician Twin Shadow. The show was described as a "tribute to the Los Angeles music scene."
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