According to a perezhilton.com following, Katy Perry snarkily took aim at John Mayer during a recent concert in NYC.  Fan Bethany emailed Perez to tell him that Katy changed up some of the lyrics to UR So Gay:

“I’m so mean ’cause I cannot get you out of your head. I’m so angry ’cause you’d rather TWITTER instead. I can’t believe I fell in JOHN MAYER!”

Apparently the audience went wild.  Betcha it put a bit of a smile on Jennifer Aniston’s face, too.