Even the biggest stars can get nervous before they perform and Katy Perry is one of them.

The singer admits she takes beta blockers before getting on stage at her concerts to deal with anxiety.

She said: ”I have to take beta blockers, I get so nervous. I think I have to get through this; I can’t let these people down, but mostly I can’t let myself down. I’ve been given a great opportunity and there are 500 bitches behind me who will snatch my weave off my head if I don’t kick-ball-change through this two-hour show.

”There is a lot of choice out there. All I’m trying to do is make great music.”

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