Kevin Mazur/Getty Katy Perry joined in on the Viva La Mayhem fun! On Monday, April 28, the "Teenage Dream" singer shared pictures and videos from Lady Gaga's Sunday night concert in Mexico City at ...

Fans of Katy Perry and Lady Gaga are describing it as 'Roar vs Applause' all over again. The two fan-favorite singers released their respective singles in August 2013, igniting a notable pop ...

Katy Perry and Lady Gaga. Friends? Rivals? Maybe the only time these pop divas have been mentioned in the same sentence recently is when Perry went to see Gaga’s Mexico City concert in April.

Katy Perry is bringing her Lifetimes Tour to the U.S. Wednesday, kicking off in Houston at the Toyota Center — and fans will ...

Lady Gaga made a surprise announcement yesterday ... online users pointed out that some fans immediately started to resell their Katy Perry tickets. "The CDMX arena has just a little over ...