It was a night with no shortage of celebrities, including Miley Cyrus, Carrie Underwood, Robin Williams, Snoop Dogg, Fergie and many others, but the biggest treat for the audience at Sunday night’s taping for American Idol‘s second annual Idol Gives Back broadcast was none other than Brad Pitt himself.

Though Brad’s involvement with the special, which seeks to use the hit show’s unmatched popularity to highlight and raise money for good causes around the world, had been announced at the beginning of the season, many had assumed his segment would be pre-taped and that he would not appear in person.

But, following a video clip of the Fight Club star touring the hurricane-devastated areas in and around New Orleans and talking to the children of displaced families in the area, the hunky star walked onto the stage of Hollywood’s Kodak Theater.

"The crowd went wild!" one audience member tells OK!. "The noise was deafening."

And even though the screaming fans began to quiet down after Angelina Jolie‘s baby-daddy gestured for everyone to calm down, you still couldn’t hear him — but only because his microphone wasn’t working!

This little tech snafu, which witnesses tell OK! had also happened earlier in the evening to fellow celeb guest Reese Witherspoon, was quickly remedied. And it even gave Idol‘s stage manager, Debbie Williams, an opportunity of a lifetime. "I just needed a reason to touch him," she joked to the audience.

The father-to-be’s appearance on the Idol stage was brief, but he did take the time to thank the fans before he introduced a video of former Idol finalist Chris Daughtry visiting the African nation of Uganda.

"Brad actually seemed quite shy," one audience member tells OK! about the superstar’s cameo appearance.

Judge for yourself when Idol Gives Back airs Wednesday night on Fox.

By Carole Glines

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