Who said "You have to believe in yourself when no one else does."?

This quote is attributed to Katy Perry.

You have to believe in yourself when no one else does. - Katy Perry

"You have to believe in yourself when no one else does."

Katy Perry Faith

Pop Singer Songwriter American Born 1984 (age 42)

"I'm just trying to change the world, one sequin at a time."

"Just be yourself, there is no one better."

"If you don't have any shadows, you're not in the light."

"Do what makes you happy, be with who makes you smile."

"Faith guides me through difficult times."

"Faith is believing when you can't see."

"You have to believe in something, or you'll fall for anything."

"Faith in God and in each other is what sustains us"