Brad Pitt by Peggy Sirota. - Peggy Sirota's exhibition GUESS WHO? is a tongue-in-cheek homage to the celebrity phenomenon that seems to be present everywhere. Sirota asked various celebrities, athletes and musicians to lend their image for an AIDS charity. The reader will be teased, challenged and surprised while looking at the photographs trying to figure out who's who. For Guess Who 172 personalities play along and actually let go of their celebrity identity.