Popsugar Entertainment Movies The Cast of Gossip Girl Then vs. Now What the Cast of "Gossip Girl" Have Been Up to Since the Show Ended 7 November 2023 by Eden Arielle Gordon View On One Page Photo 5 of 18 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Leighton Meester Then Meester played the complicated queen bee Blair Waldorf on "Gossip Girl," taking on the role when she was 21. Previous Next Start Slideshow MoviesPenn BadgleyGossip GirlLeighton MeesterBlake LivelyTV