44. Gwen Stefani
Rock star, designer, and mother Gwen Stefani started her busy year off on tour with No Doubt. She switched gears in September to show her L.A.M.B. collection during New York Fashion Week, shortly before her 40th birthday. Gwen keeps rolling out new clothes and fragrances and is now back in the studio with her band. Even with all that, she saves the majority of her time for fun with Gavin, Zuma, and Kingston.