Before Blake Lively was a household name in Hollywood, she was an Upper East Side socialite on the hit show Gossip Girl. Not only did her character Serena van der Woodsen inspire us with her killer fashion sense, but her scenes were constantly filled with some GIF-worthy moments. While Blair was the queen bee of Constance Billard, Serena was certainly the reigning champ of facial expressions. In honor of the actress's 29th birthday this week, check out her most relatable faces here, and then get your nostalgia fix by seeing what the rest of the cast is up to now.