The California Gurls hitmaker was spotted in the crowd at Gaga's concert in Mexico City, Mexico on Sunday night. Shortly ...

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.

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

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