The 33-year-old actress revealed her embarrassing wardrobe malfunction had a Japanese journalist so flustered he couldn't get his equipment to work.
She said: "A friend made me wear this top for an interview. I had one t*t entirely hanging out in front of this Japanese man.
"I think I really scared him. He was fumbling around and couldn't get his tape recorder to work." The 'Pearl Harbor' beauty - who has a seven-year-old daughter Lily from her relationship with actor Michael Sheen - also confessed to recently flashing her bottom when her trousers split.
She added: "My trousers had worn through so much you could see my bottom. My daughter Lily found it very funny. I was mortified! "I had to get my friend to sew them up. I'm usually at the playground. I only get done up and get the slap on for special occasions."