Jackson will join the previously announced Victoria Clark for the production at the Vineyard Theatre, which begins a three-week Lab Production run Dec. 8. Playwright Silver will also co-star in the piece.

Clark, according to press notes, will play "an ambitious actress married to a desperate playwright, played by Silver, while Jackson plays an aspiring young actor whose arrival mixes things up even more." Terry Kinney directs.

Cheyenne Jackson, who was recently seen in the film "United 93," has appeared on Broadway in All Shook Up, Aida and Thoroughly Modern Millie. He starred in the premiere cast of Altar Boyz, and his regional credits include West Side Story, The Most Happy Fella, Children of Eden, Hair, Carousel, Damn Yankees and Kismet. Jackson is a member of the Broadway Inspirational Voices.

The Vineyard Theatre is located in Manhattan at 108 East 15th Street. For tickets call (212) 353-0303 or visit www.vineyardtheatre.org.