20 celebs whose real names you don’t know (+Photos)

11. Bruno Mars – Peter Gene Hernandez

Born in Honolulu, Hawaii as Peter Gene Hernandez, Bruno Mars has amassed six number-one singles on the Hot 100, and twelve top-ten entries in just five years. Internationally, he has sold twelve million albums, and over one hundred million singles.

The Bruno part of his name comes from a nickname his father used to call him, and the Mars part because he felt he did not have enough hutzpah and was always told he was out of this world (since his head always seemed to be in another planet).