Fergie sings at a… car museum?

Fergie -- aka Stacy Ferguson of the band Black Eyed Peas -- sports some well-toned abdominal muscles as she performs at a 50th birthday party for Christian Audigier on May 23, 2008. This was at the Petersen Automotive Museum in Hancock Park in Los Angeles, California. Fergie was born in 1975, so she turned 33 the year this photo was taken.