BRAD PITT was left speechless after a chance encounter with pop superstar CHRISTINA AGUILERA at his local health food store.

Aguilera, who shares the same birthday as the movie hunk, couldn't resist approaching her hero when she saw him at the shop in Hollywood. But fellow shoppers, who stood amazed during their brief chat, claim Brad looked uncomfortable and didn't seem to want to stop and chat. (KL/NE/NFA)

Source: WENN