Leighton Meester sported a sunny Stella McCartney skirt, Brian Atwood pumps, and bright lips on the set of Gossip Girl this morning in NYC. Leighton was also seen toting a copy of A Game of Thrones as she hung out in between takes. She was back to work on the set of the CW show after taking some time last week to promote her new movie Monte Carlo with costar Selena Gomez. It's been a busy Summer for Leighton, who also was in Boston shooting her new film I Hate You, Dad late last month and recently helped her friend Vera Wang launch her new fragrance Lovestruck back in the Big Apple. The actress may be tied up with her varied acting and fashion commitments, but she's also still pursuing a career as a singer, recently selling out LA's Troubadour with her band Check in the Dark.