Though style setters like Jessica Alba, Diane Kruger, and Lily Collins have recently embraced the crop top trend, Gwen Stefani has been flaunting her enviable abs for over a decade. From her No Doubt era to her designer days to motherhood — can you believe she has two adorable kids and possibly another bundle on the way? — ab-baring separates have been a constant in Gwen's rocker-chic style since day one. The style chameleon has made a strong case for the once-risqué fashion, revealing hours of gym dedication in figure-flashing ensembles on stage and the red carpet. In honor of Gwen's special day, we are counting down her top 30 midriff-baring outfits, then hitting the gym to log a few crunches.