The "Bad Blood" between Taylor Swift and Katy Perry is perhaps the most drawn-out, vague feud in celebrity history.
Katy Perry - Page 4
Does Katy Perry have her sights set on the Oval Office?
Katy's all smiles on the September cover of 'Vogue Japan.'
Katy's not too amused by Taylor's tweets to Nicki Minaj — and she's calling her out.
The two nuns barring Katy from purchasing their Los Angeles convent have stepped up their battle.
Sure, Katy's first Emmy nom is partly due to its extravagant set pieces and her performance, but even she knows who the VIP is.
If tying a record with Michael Jackson wasn't enough prestige for Katy Perry, the singer is now the only artist to have two music videos hit over 1 billion views on Vevo.
Little Monsters? KatyCats? It's time to cast your votes.
Katy Perry and John Mayer were seen, once more, getting cozy during a Grateful Dead show.
Happy 4th of July! Celebrate the stars and bars with all-American jams from Katy Perry, Demi Lovato, Taylor Swift and more.