WATCH: KATY PERRY - BIRTHDAY (MUSIC VIDEO)

The music video of Katy Perry's latest single "Birthday" is already out. In the video, the "Roar" singer dresses up as a series of birthday entertainers and she's completely unrecognizable.

She dresses like an old woman -- an old burlesque dancer named Goldie. She puts on a clown costume and becomes a downtrodden clown. She becomes a vapid princess and attempts to paint little girls' faces.
She tells jokes at a Bar Mitzvah as a Jewish MC. And she even eats a mouse.

Katy Perry's music videos are always hilarious. Hahahaha! Love her.