Who said "Believe in yourself and others will believe in you."?

This quote is attributed to Katy Perry.

Believe in yourself and others will believe in you. - Katy Perry

"Believe in yourself and others will believe in you."

Katy Perry

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."