Who said "Be yourself, because everyone else is already taken"?

This quote is attributed to Spice Girls.

Be yourself, because everyone else is already taken - Spice Girls

"Be yourself, because everyone else is already taken"

Spice Girls

Pop Group British Born 1994 (age 32)

"Wannabe is about friendship and girl power above all else"

"We're not just a girl band, we're a girl power movement"

"Life is about having fun and enjoying every moment"

"Girl power means believing in yourself no matter what"