Kate Bosworth and Jim Strugess in a scene form '21'

The Superman Returns star drank to calm her nerves before the revealing scene - but admits she overdid it.

She says, "We were both so drunk. Jim and I became such good friends, we decided to have a couple of drinks, loosen up and go for it."

Sturgess adds, "We were on Grey Goose (vodka), I think. It was brilliant for about half an hour. As we continued to drink, it just became sloppy and messy. I couldn't stand up at one point."

In 21, Bosworth and Sturgess play college students who use their brains to break the bank in Las Vegas.

Source: WENN