Katy Perry Shuts Down Miley Cyrus' PDA at L.A. 'Bangerz' Tour Stop

Katy Perry kissed Miley Cyrus...and she did not like it, not at all.

While on stage Saturday at Staples Center in Los Angeles, Miley beckoned Miss Perry to the edge of the stage for some girl-on-girl action. Katy went for a peck on the cheek, but Miley tried to slip in some tongue and Katy shut it down HARD.

Having a sense of humor about the whole thing, the "Dark Horse" singer tweeted about the incident shortly thereafter.

Katy wasn't the only celebrity in the audience though. Also in the attendence wereHilary Duff, Max George, Nicole Richie, Joel Madden, Kendall Jenner, andKhloe Kardashian.

...and Diane Keaton.