Watch: Katy Perry Throws Shade during Kanye West Concert

Earlier this week, Katy Perry celebrated part of her 32nd birthday at a Kanye West concert in Los Angeles. But, as one might expect, the one song that disses Taylor Swift played that very night.

T-Swift and Katy Perry maintained a friendship in 2008, but over the years, drama transpired and now they are not even on speaking terms. Ever since Swift accused Perry of stealing her back-up dancers during a tour, the two cannot stand each other. So when the 'California Girls' star posted a video of her dancing to 'I feel like me and Taylor might still have sex,' the feudal flames only grew higher.