No Doubt. It is the beautiful Gwen Stefani

Gwen Stefani is undoubtedly one of the most beautiful and glamorous women alive. In order to keep herself at the top of her fitness game, she said: "I'll never be one of those women who says, 'I look like this because that's how I am,'" Gwen tells Grazia magazine. "I work out a few hours every day. It takes a lot of effort for me to look like this. If I slack off, it really shows. That little chubby kid starts coming out and I have to rein her back."

Her strong work ethic is incorporated not only to her job as a performer, but into the gym as well.