Jordin Sparks - American Idol
Jordin Sparks won American Idol when she was 17 years old... That's huge! Even with that accomplishment, a lot of people seem to forget that she was ever on the show to begin with. She sold millions of albums, won bunches of awards, and even took on Broadway in Lin Manuel Miranda's In The Heights.
Miranda Lambert - Nashville Star
If there are pop-star TV shows, then there are country-star TV shows. Miranda Lambert is a famous country musician now, but she started out as a simple reality star contestant. She went on the show in 2003 when she was just 19-years-old. Look how far she's come!