Who doesn't like thick eyebrows? From Cara Delevingne to Lilly Collins, several celebs serve as inspiration for the thick brow look. If you haven't noticed, how you shape your eyebrows has always been ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Scroll on for the full list of the best eyebrow-growth serums that team Cosmo has tested, along with ...