Will.i.am was joined by stars including Alicia Keys and Estelle at his charity event in Los Angeles.
British singer Estelle sang Fergie's portion of The Time (Dirty Bit).
The show also featured Bobby Brown and Ludacris, who both earned roaring cheers from the crowd.
Will.i.am said at the end of the evening that he raised 3.3 million dollars.
"We're having fun, but we're also collecting funds," he told the crowd.
The Peas closed the night with the massive hit I Gotta Feeling.