Celebrity: Gwen Stefani
Second job: All-around mogul
The deets: As a singer, Stefani was always known to be fashion-forward, and it was little surprise when in 2004 she launched a fashion line called L.A.M.B. (an acronym for her solo album, "Love. Angel. Music. Baby."). But if the line's existence was no shock, its astounding success was. The brand caught on with fans and fellow celebrities alike, hitting almost 300 stores and by 2007 was approaching sales of $90 million per year. Stefani has expanded her offerings to include fragrances, bags and shoes, and she recently paired with Target for an affordable kids' fashion line called Harajuku Mini, which launches in November.