Sandra Bullock sat down with our own Mary Hart Saturday afternoon to talk about her new movie with Ryan Reynolds, 'The Proposal,' and she was shocked to find Mary in a sling!

"That's pretty insane," says Sandra. "It just hurts looking at it. ... Is the pain pretty bad?"

"It's not bad," says Mary, jokingly explaining, "The true version of the story is I was dancing naked on the table at Cabo Wabo, I fell, it should be on YouTube anytime and I'm just horrified."

"I love it -- I'm going to go on YouTube and see if I can see it," laughs Sandra. "That's insane."

Mary plans to auction off her sling to benefit Children's Hospital Los Angeles, and she asked Sandy to be the first to sign it! How did she really break it? You'll have to watch ET Monday night to find out!

In theaters June 19, 'The Proposal' stars Sandra as a feared and demanding Big Apple boss who finds herself faced with deportation back to Canada when her visa application is denied. Enter Ryan, her miserable assistant, who she coerces into marrying her in order to gain U.S. citizenship. Forced with visiting Ryan's family up in Alaska, will their ruse create suspicion, or sparks?

Watch ET for more with Mary, her sling and Sandra Bullock! For more movie news and exclusives, head over to ETonline's Summer Movie Guide!