Carrie Underwood has been hailed as the most successful American Idol winner. She's now classed as one of the most richest country music stars.

although Katharine McPhee lost out to Taylor Hicks during American Idol's season five, she went on to become a successful singer and actress. Three of her tracks made it on to the Billboard Hot 100 Chart.

Notoriously, Luke Combs, Tori Kelly and Maren Morris were turned down from American Idol or The Voice before making it big.

Unfortunately, singer Justin Guarini lost out on the American Idol crown back in season one. Kelly Clarkson went on to become the very first winner of the show.