Blake Lively uses Kérastase Mousse Curl Ideal

If one thing's synonymous with Blake Lively, it's her long, blond hair. For someone who can pull off basically any beauty look, for the 10+ years she's been in the public eye, this has been her signature.

Blake's sophisticated coif is simple in theory — a clip here, some hairspray there — but keeping loose waves bouncy throughout a busy day is no small feat. Formulated with the brand's unique Pro-Keratine Complex and hydrolyzed elastin, Kérastase's Mousse Curl Ideal provides hair with an impressive 12 amino acids to improve strand's elasticity and sustain the hair's bend.