Doors will open at 6 PM for the 8 PM show, which is titled A Night At the Rock Show. The former "American Idol" contestant will be joined by his Rock of Ages co-star Tom Lenk.

A Brooklyn native, Constantine Maroulis is a graduate of both the Boston Conservatory and the Berklee College of Music. He trained as an apprentice at the Williamstown Theatre Festival and appeared as Roger in a tour of Rent. In addition to his performances on "American Idol," he has also been seen on "Law & Order: SVU" and in several independent films. Maroulis played a previous engagement at the Public Theater's Joe's Pub as well as a stint in Broadway's The Wedding Singer and Off-Broadway's Jacques Brel Is Alive and Well and Living in Paris. He was also seen in the Premier Theatre Company's production of Jesus Christ Superstar.

Maroulis currently stars in Rock of Ages, which plays Broadway's Brooks Atkinson Theatre.

The Highline Ballroom is located at 431 West 16th Street (between 9th Avenue and 10th Avenue). For tickets, priced $20, call (866) 468-7619 or visit www.ticketweb.com.