Fergie from the Black Eyed Peas shares her favorite Oprah Show memory, when a flash mob took over Chicago's Magnificent Mile while the Black Eyed Peas performed.
"It was pretty much one of the most amazing performances we've ever had," she says. "Twenty thousand people filled up Michigan Avenue. We were doing 'I Gotta Feeling.' Only one girl's dancing, and all of a sudden, it started building and building, and it was a surprise for Oprah. Not everyone gets to do that."