Popsugar Beauty Gwen Stefani Gwen Stefani Beauty Style 2015 15 Times Gwen Stefani Proved That 2015 Is Her Prettiest Year Yet December 28, 2015 by Lauren Levinson View On One Page Photo 9 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Sept. 18, 2015 At the Kaaboo festival in Del Mar, CA, Gwen showed off a pumped-up ponytail and sexy abs (can you believe she has three kids?!). Previous Next Start Slideshow Gwen StefaniCelebrity HairCelebrity MakeupCelebrity BeautyBest Of 2015