Black Eyed Peas singer and multiplatinum solo artist Fergie is known for her booming voice as well as her enviable abs. While filming 'Oprah s Next Chapter' at the California vineyard Fergie bought for her father, Oprah Winfrey discovered the secret to Fergie s physique -- juicing! But this former child star and wife of actor Josh Duhamel doesn t just dine on fruits and vegetables: Fergie says she'll splurge on pizza, meat and dairy. 'Oprah's Next Chapter' airs Sundays at 9 p.m. ET on OWN.