kimkartdashian081411_03_vh1.jpgOn Sunday, A-listers flocked to the Hollywood Palladium for VH1's Do Something Awards.

The awards, which air Thursday, recognize people under age 25 who are bettering communities. Justin Bieber was honored with the Music Artist award for his work with Pencils With Promise, an org focused on education. He beat Nick Jonas, Lady Gaga, Adam Lambert, The Black Eyed Peas and Linkin Park.

The star-studded guest list included David Beckham, Olivia Wilde and Tyra Banks, Adam Lambert, Kristen Bell, Mario Lopez, Jon Cryer, Olivia Munn, Amy Poehler and Nick Cannon.

Demi Lovato gave a comeback performance -- her first since rehab -- with "Skyscraper." See pics of all the celebs in our gallery below!

Kim Kardashian introduced pal Demi and also reunited with her fav younger man, Bieber!

Kim Tweeted pics of herself with Justin and Demi ... see the pics and get the full list of nominees after the jump!