Hollywood's hottest young stars stepped out for a great cause last night -- with people like Kim Kardashian, Justin Bieber, Demi Lovato, David Beckham and more hitting the red carpet for the Do Something Awards.

The event honored the "best young world-changers," both celebrity and non-celebrity. A $100,000 prize was handed to Sarah Conk -- a young "do-er" who started The Sparkle Effect, a program that helps create cheerleading squads that include students with disabilities.

Justin Bieber won for Do Something Music Artist, Olivia Wilde nabbed Movie Star and Sophia Bush picked up a trophy for her Twitter.

The show, hosted by "Glee" star Jane Lynch, also featured performances by Demi Lovato, Foster the People and OneRepublic featuring B.o.B.

Check out over 100 pictures from the red carpet, show and backstage -- where Bieber once again mingles with BFF Kim Kardashian.

The awards show will air on Thursday, August 18 at 9pm ET/PT on VH1.

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