Shia LaBeouf turned 21 last month, but the "Transformers" star had no plans to spend the day downing his first legal drink.

"People say, 'What are you doing for your 21st birthday, Shia?' " he said in an interview published in the August issue of Vanity Fair (on newsstands July 10). "I'm like, 'I'm making an Indiana Jones movie.' What's better than that? ... I won't have a sip until after Indy."

Even then, LaBeouf probably won't go too crazy -- the actor, who used to accompany his father to Alcoholics Anonymous meetings, said he's not a big partier even if he has dabbled. "To say that I've never had a drink or smoked weed--coming from my family--is insane. But also, I know what it does if you get out of control. I know how hard it was to get my life to where it is. There's so much riding that those small little joys of the high are not interesting to me."

Shia's mother was a hippie and his father a professional-clown who sold drugs on the side.