Haim: Two of the band's members - Este and Danielle joined manufactured girls group 'Valli Girls' back in 2005 (top and bottom right)
Katy Perry; A world away from singing about 'California Girls' and 'Teenage Dreams', Perry first got her start in the industry under her birth name of Katy Hudson, releasing a self-titled gospel Christian album in 2001 at age 16.
Billy Joel; Prior to becoming 'The Piano Man', Billy Joel was part of drum-and organ-based heavy metal band 'Attila', putting out a self-titled album in 1969. Joel went on to describe it some years later as "psychedelic bullshit." Image: www.cracked.com.
Trent Renzor; The man responsible for gloomy, industrial goodness with Nine Inch Nails started out as a keyboard player in early '80s new wave cover band called 'Option 30' (that's him on the far right!) Image: www.cracked.com.
Dr. Dre; Hard to believe, but the man responsible for creating some of the most explicit songs in hip-hop with N.W.A (and his solo career after that) started out in an electro-hop act called 'World Class Wreckin' Cru' - donning white sweaters and a bucketload of cheesy poses. Image: www.cracked.com.
Tori Amos; The cult favourite singer/songwriter had a forgettable beginning to her career as the frontwoman of 80's synth-pop band 'Y Kant Tori Read'. Image: www.popsike.com
Justin Timberlake; Before his *NSYNC days and establishing himself as a solo star and and actor, JT got his cheese on at a young age with the likes of former girlfriend Britney Spears and Christina Aguilera as part of The Mickey Mouse Club. Image: www.snakkle.com
Alanis Morrissette; Before she become a household name with 'Jagged Little Pill', she released two albums of diabolical bubblegum pop as a teen star, where she also experimented with rap and rough backing tracks. Once she became a mega-star in 1995, her record label ordered all copies of the albums from her past life - 'Alanis' and 'Now Is the Time' to be pulled from circulation.
Evanescence; Before surfacing in 2003 and storming the world with their faux-goth, metal-lite tunes, Evanescence originally flogged their demo CD 'Origin' to the Christian rock market in an attempt to build a fanbase. Guitarist Ben Moody is quoted as saying: "The message we as a band want to convey more than anything is simple - God is Love." Image: www.cranked.com
Drake; The R&B mega-star got his first break as an actor on Canadian teen drama Degrassi in 2001, playing a high school basketball star who eventually got shot.