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.

Gwen Stefani and Blake Shelton ... complemented by high heels and her blonde hair styled in a ponytail. Blake opted for a more laid-back look with blue jeans, a blue and white shirt, a ...

Gwen Stefani and ... a casual affair. Stefani was dressed in a grey tank top under a flannel shirt, which she paired with ...