What American idol runner-up stars on Smash?
Katharine McPhee Katharine Hope McPhee (born March 25, 1984) is an American actress, singer and songwriter. She gained fame in May 2006 as the runner-up on the fifth season of "American Idol."
Constantine Maroulis Constantine James Maroulis ( ; born September 17, 1975) is a Greek-American actor and rock singer from Wyckoff, New Jersey. He was the sixth-place finalist on the fourth season of the reality television series "American Idol", and received a nomination for the Tony Award for Best Performance by a Leading Actor in a Musical for his role in "Rock of Ages". He starred in the title role in "Jekyll and Hyde" on Broadway, for which he received a Drama League Award Nomination for a Distinguished Performance Award.