Some Hollywood actresses are cautious about revealing too much skin but 20-year-old Scarlett Johansson had to be persuaded to keep her underwear on, according to her director in The Island, Michael Bay.

Bay said he was prepared for the usual actress nerves. She's standing there and she says, I'm not wearing this cheap bra. I'm going naked', Bay said. I said, 'It's PG-13, you have to wear the bra'.