Renee Zellweger, star of the upcoming "Leatherheads," dished to In Style's April issue about hair, her prom and costar and friend George Clooney. Highlights include:

Her Green, Flamenco-Style Prom Dress:
"I didn't know you shouldn't wear forest green in May in Katy, Texas." And the hair can be summed up in three words: "Eighties, curling iron, hairspray. I defied Mother Nature and all her humidity with every ounce of tenacity and hairspray I had. I shellacked my bathroom countertops with the residual spray."

Her Newly-Short Hair:
"It's still attached to my head, by the grace of God," laughs the star, who has gone from brunette to blonde and everything in between. She describes the transition as "Ronald McDonald red, faded to pumpkin, then it was pink, then mango."

"Leatherheads" Director and Costar, George Clooney:
"I heard George was making a movie and I said, 'When?' If he had asked me to make peanut butter sandwiches for the catering, I would have said, 'Crunchy or smooth?' It's never less than great with him. People want to make an effort for him," says Renee.

Acting:
"I like the struggle of my work," she confesses. "I like when you're shooting in 47 degrees below zero and everybody looks the same--like a stack of big black tires with Herman Munster boots on--and it's hilarious and we're getting done what we'd hope to do that day. That's gold."

Having a Low Day:
"I'm fortunate; I think I was born happy," says the optimist. "If I have a bad moment, it doesn't take me long to switch the gear back. I say, 'That sucked,' and move on."

To read the whole interview with Renee, get the April issue of In Style, available on newsstands now.