Charlize Theron showed up at the Oscars to cheer on Jeremy Renner her new squeeze from "The Hurt Locker."

She looked a hundred times different to the Theron who did the rehearsal the night before.

On Saturday night, Theron, wearing just heels and jeans and no make-up, practiced her lines and angles for the camera.

Chatting with a producer, she said, "Well, I'm not wearing underwear."

The loudspeakers roared into life as a director barked: "Too much information!"

Theron, who has her own Oscar laughed it off.

"I didn't realize everyone could hear me," she said, before thanking the crew and waving goodbye."