Paws up, little monsters! Lady Gaga is throwing the Mayhem Ball Tour this summer. The pop icon will kick off the tour in Las ...

Katy Perry supported Lady Gaga at her Mexico City concert on Sunday, April 27, days after Perry launched her Lifetimes Tour.

Katy Perry was spotted in the crowd at Lady Gaga's concert in Mexico City, a day after Perry's own performance. Perry shared a sweet message for Gaga.

Lady Gaga’s "Poker Face" hits new peaks on Billboard’s global charts 15 years after release, fueled by her standout ...

Lady Gaga will embark on an arena tour this summer. (Kevin Mazur/Getty Images for Coachella) ...