Fellow pop stars Justin Bieber, Selena Gomez, Carly Rae Jepson and Victoria Justice all came out for the singer’s big night (as well as family members like her grandmother and her preacher parents, Keith and Mary).
But one face who she probably never wanted to see was not too far away. Her ex-husband Russell Brand was partying just 10 minutes away at the FX Summer Comedies Party at Lure nightclub.
Part of Me, which delves into Katy and Russell’s painful divorce, opens in theaters on July 5.
[Photo credit: Wenn]