Brad Pitt brad-pitt-idol-b.jpgPhoto Credit: Ray Mickshaw/FOX

American Idol fans got quite the surprise at Sunday's taping of Idol Gives Back as stars such as Brad Pitt, Miley Cyrus, Carrie Underwood and Robin Williams took the Idol stage for a good cause.

Surprisingly, rising pop star Miley Cyrus wasn't the main attraction - hunky dad Brad Pitt stole the spotlight and "the crowd wouldn't stop screaming," stated a source for Us Weekly.

Robin Williams even joked that he wanted "Brad and Angelina to adopt me!"