"Happy 31st birthday to the stunning and talented Taylor Momsen! It's hard to believe our once rebellious and angsty little Jenny Humphrey from Gossip Girl is now a classy and mature 31-year-old. You've gone from "Pretty Reckless" to simply gorgeous and we couldn't be more proud. May this day be filled with love, laughter, and plenty of cake (but no smoking, we're adults now). Cheers to another year of slaying the music industry and inspiring us all. Happy birthday, Taylor!" #31andThriving #MomsenCrush #ForeverYoung