Popsugar Beauty Millie Bobby Brown Millie Bobby Brown Long Ponytail Millie Bobby Brown Debuted the Coolest Ponytail Trend of the Summer July 3, 2019 by Jesa Marie Calaor First Published: July 1, 2019 View On One Page Photo 1 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Millie Bobby Brown's Hairstyle at the "Stranger Things" Season 3 Premier Previous Next Start Slideshow Beauty NewsBeauty TrendsCelebrity HairCelebrity BeautyMillie Bobby BrownHair