Bruno Mars

After a string of behind-the-scene jobs -- everything from writing songs for Brandy to impersonating Elvis -- singer/songwriter/producer Bruno Mars put his name on top of the charts in 2010 by collaborating with rapper B.o.B for the single "Nothin' on You." Born Peter Hernandez in Honolulu, Hawaii, Mars' kicked off his career at the age of four fronting his uncle's band as Oahu's youngest Elvis impersonator. By 2010, he had released his debut solo EP, It's Better If You Don't Understand.. Later in the year he released a full-length album, Doo-Wops & Hooligans. The first single from the album, "Just the Way You Are," topped the Billboard Singles chart the week before the album's October 5th release.