1. Katy Perry
Before her massive pop career, Katy performed as a Christian singer under the name Katy Hudson.
2. Eddie Vedder
This epic rock star recently released an album of cute ukulele songs. We approve!
This superstar and hip hair icon got his big break in the screamo band From First to Last.
4. Queen Latifah
Our favorite hip-hop Queen recently released a soulful jazz album.
5. Jessica Simpson
Another Christian artist turned pop star!
6. Maroon 5
Before funk-inspired alternative band Maroon 5, these guys were in a garage rock band called Kara's Flowers and toured with ska-punk bands like Goldfinger and Reel Big Fish.
7. Sugar Ray
Sugar Ray began their career as a hardcore band before making a total 180 into their poppy '90s style.
8. Dee Dee Ramone
That's right, folks. Dee Dee Ramone recorded a rap album after joining the Ramones. Why? We may never know.
9. Snoop Dogg/Lion
The transition from Snoop Dogg to Snoop Lion also came with a genre change: Snoop's most recent album is a reggae album!
10. Gwen Stefani
From ska-punk princess to pop queen. We love you either way, Gwen!