Who said "Be yourself; everyone else is already taken."?

This quote is attributed to Eminem.

Be yourself; everyone else is already taken. - Eminem

"Be yourself; everyone else is already taken."

Eminem

Hip Hop Rapper American Born 1972 (age 54)

"You can make anything you set your mind to be real."

"Everybody has a specific thing they do, and they do it great."

"I am whatever you say I am."

"The only thing you can count on is yourself."