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 ...

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 singing the praises of fellow pop superstar Lady Gaga after catching her brand new tour. The "Firework" singer took to her Instagram Stories on Monday (April 28) to share some of the ...

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

On Sunday night, Katy Perry was spotted in the crowd at Lady Gaga's concert in Mexico City, a day after Perry's performance there. Little Monsters spotted Perry at Estadio GNP Seguros as she ...

Selena Gomez, Ariana Grande, Lady Gaga and Kendrick Lamar each scored a leading four nominations each for the Nickelodeon ...

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.