Leighton Meester Hits Katy Perry Concert

Leighton Meester and her boyfriend, Gossip Girl costar Sebastian Stan, hit up the Katy Perry at NYC’s Hammerstein Ballroom on Tuesday night (July 28).

The 23-year-old actress, who was also accompanied by younger brother Lex, arrived late to the concert because she had to work (she arrived just in time for the last three songs). Leighton only stayed backstage and didn’t sit in the VIP balcony area with Rihanna and Donald Trump.

Cobra Starship opened up for Katy and Leighton wanted to perform with them during “Good Girls Gone Bad” but work got in the way.

UPDATE: Leighton is wearing a sexy sheer Chris and Jaime jumpsuit, Chloe bag, Alexander McQueen shoes and the Love Rocks NY “Anchor” pendant.