Katy Perry and Perez Hilton: BFF?

Katy Perry spent Sunday night partying with a clan of gay-friendly pals, including burlesque model Dita Von Teese, a pretty redhead, a handholding hottie, and her new BFF Perez Hilton - who, by the way, she's been spending WAY too much time with for a chick with real celebrity friends. 

The happy-looking bunch caught up over dinner at West Hollywood's Sur Restaurant before heading to the Abbey for drinks, dancing, and lots of giddy laughter. 

What's so funny?