Britney Spears

Before being propelled to international fame with '...Baby One More Time', 15-year-old Britney was in a girl group called Innosense.

However, her manager Larry Rudolph thought she could make it as a solo performer.

Britney left the group when she landed a record deal with Jive and spent the next decade on top of the world, meanwhile, Innosense released an album that failed to chart.