Katy Perry has admitted she was nearly sick with nerves when she met Madonna recently. The pair were introduced backstage during the Queen of pop’s US tour. "Madonna invited me to one of her shows - I was summoned by the queen herself. I went backstage and I am never usually nervous but I lost it,” Katy tells the Sun. "I got so weak in the knees and I thought I was going to throw up. But I needn't have worried. She was cool. She was so petite. She comes up to my chest and I thought she was supposed to be a giant."
