Throughout season four of the programme, Carrie Underwood attained the title of "American Idol."
Kelly Clarkson won the first season of "American Idol" in 2002, and since then, her star has risen.
Despite coming in second place, Adam Lambert's glam-rock aesthetic helped him stand out during the eighth season of "American Idol."
Jennifer Hudson's time on "American Idol" may have ended too soon; she came in seventh place for the third season.
Katharine McPhee has found success in the music and acting industries since placing second in season five of "American Idol."
Jordin Sparks was the youngest "American Idol" champion ever when she took home the title in season six at the age of just 17.
Chris Daughtry finished fourth in season five of "American Idol" and later found fame as a rock musician.
Despite not making it to the finals after entering the "American Idol" competition, Kellie Pickler finished fifth in season five.
Elliott Yamin came in third place at the end of season five of "American Idol," which helped him go from working as a pharmacy counter clerk to being a well-known singer.
David Cook, a singer-songwriter, entered "American Idol" on a whim and won the seventh season.
All about Robert Downey Jr.
All about Leonardo DiCaprio
All about Will Smith