'American Idol' alumni: Where are they now?

6 of 32: 'American Idol' Season 2' runner-up Clay Aiken debuted his multi-platinum album, 'Measure of a Man' after the season ended in 2003 and then released four more records, including 'Tried and True' in 2010.

Aiken also took his talents to a different stage - Broadway. He made his debut as Sir Robin in Monty Python's 'Spamalot' in 2008 and performed in the musical until 2009.

In 2008, Aiken and his friend, female music producer Jaymes Foster, welcomed a baby boy named Parker.

Aiken also created the National Inclusion Project in 2003, accepted a position as a UNICEF ambassador in 2004, and was appointed for a two-year term to the Presidential Committee for People with Intellectual Disabilities in 2006. He also wrote a best-selling book, 'Learning to Sing: Hearing the Music in Your Life,' and made public appearances ito speak against gay bullying.

In January 2012, it was announced that Aiken will participate on Donald Trump's NBC reality show 'The Celebrity Apprentice.'

(Pictured: Clay Aiken appears in a promotional photo for the NBC series 'The Celebrity Apprentice' in 2012.) ( Photo / NBC)