Katy Perry: Britney, Ke$ha & Justin Bieber 3-Some

Katy Perry wants Britney to have a threesome with #Keshawho and Justin Bieber, according to a recent Tweet.

We know she's joking, but the thought of it... GROSS! That's an image I'll need burned out of my brain!

Britney solo, please! No, Jordan. Just... no.