Maroulis, who plays record promoter Constantine Parros on the daytime drama, will be joined by fellow cast members Mackenzie Mauzy and Kyle Lowder.
The concert is tied in to an online contest called "Boldface Challenge" which ran in the first few weeks of August.Boldface Records. Viewers, who voted by text or online, were automatically entered into a sweepstakes for various prizes and a grand prize of a trip for two to Los Angeles to visit the site of the popular daytime drama.
The grand prize winner of the sweepstakes will be announced on Friday's episode, and the duet challenge winner will be announced on Monday.
During the concert, Yamin will perform his single, "Wait For You," McLaughlin will perform "Beautiful Disaster" and Maroulis will present his song "Fading Into You."
Yamin appeared on season five of "American Idol," ending in the top three before being eliminated. Maroulis, who appeared on season four, was eliminated after making it to sixth place.
By Judy Faber