Leighton Meester is known for her brunette locks that helped her bring the role of Blair Waldorf to life on "Gossip Girl," but it's far from her natural shade.

Leighton Meester has gone auburn for spring! The actress, 38, debuted her red hair transformation at the 2025 SAG Awards, held at the Shine Auditorium in Los Angeles on Sunday, Feb. 23.