Gwen Stefani has always known exactly what her "uniform" is. Whether it's thrifted men's pants in the 'Hollaback Girl' music video or Valentino at the CMT Music Awards, Gwen's signature style is ...

Unquestionably cool, Gwen Stefani's style evolved from the '90s to starring on The Voice. From her hair to her abs, the Instagram favorite leaves no doubt that she's always on point.