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

Katy Perry loves sharing her woman’s world with Lady Gaga. In the crowd at Mother Monster’s ¡Viva La Mayhem! concert in ...

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

The Little Monster-KatyCat stan wars can stop: these pop divas are friends! On Sunday night, Katy Perry was spotted in the ...

When pop extraordinaire Lady Gaga announced plans to tour in Australia, the ensuing frenzy from both fans and casual ...