"I think people can appreciate a songwriter who shows different sides," says Katy Perry. "The whole angst thing is cool, but if that's all you've got, it's just boring. Everything I write, whether it's happy or sad, has a sense of humor to it. Someone told me the other day that I'm a bit like Lucille Ball. They said, 'You look pretty put together on the outside, but inside there's just something a bit wrong.'"

Comparisons to Lucille Ball only tell half ...full biography