Katy Perry is promoting her craptastic movie, Part of Me, in Rio de Janeiro, Brazil. Just days ago Katy was photographed in a bikini, lounging by the pool in Miami.

Insane! Why is John Mayer's future ex still promoting her boring "documentary"? Just release it on DVD and call it a day already.

I'm loving Katy's yellow dress though. When she doesn't have her breasts hanging out, she finds a way to cover up while still flaunting her cleavage.

Photos: Pacific Coast News