Katy Perry sang ‘Happy Birthday’ to her mom… with 10,000 backup singers.
Katy Perry knows how to make her mom feel special on her birthday — get an entire concert audience to sing to her live on a ridiculously huge phone.
Katy — or “Feather” as her mother, Mary, calls her — took some stage time during her show in Tampa Friday night to call up Mom for her 70th birthday… and it was a hit.
