The singing actor will again step into the role of Billy Flynn for a limited engagement beginning March 8 and continuing through March 25.

Sieber will be stepping in for Brent Barrett, who plays his final performance as Flynn March 7.  Barrett will rejoin the show March 26.

A two-time Tony Award nominee for his performances in Shrek and Spamalot, Christopher Sieber's Broadway credits also include Thoroughly Modern Millie, Into the Woods, Beauty and the Beast, Triumph of Love and A Christmas Carol. His other New York stage credits include Off-Broadway's The Kid, Avow and The Boys in the Band. His television and film credits include "Morning Glory," "Pushing Daisies," "Johnny and the Sprites," "See You in September," "It's All Relative," "Two of a Kind," "Sex and the City," "Ed," "Guiding Light," "All My Children" and "Another World."

The Broadway company of Chicago currently stars Bianca Marroquin as Roxie Hart, Leigh Zimmerman as Velma Kelly, Raymond Bokhour as Amos Hart and LaVon Fisher-Wilson as Matron "Mama" Morton. (As previously announced, Roz Ryan rejoins the company as Matron "Mama" Morton Feb. 28, and supermodel Christie Brinkley is set to make her Broadway debut as Roxie Hart for an 11-week engagement beginning April 4.)

The revival of Chicago began life as one of the three annual Encores! presentations offered by City Center. The musical opened on Broadway at the Richard Rodgers Theatre in November 1996 where it remained through February 1997. The musical transferred to the Shubert Theatre on Feb. 11, 1997, and played that house through Jan. 26, 2003. The revival reopened at the Ambassador Theatre, its current home, on Jan. 29, 2003. Chicago won the Tony Award for Best Revival of a Musical in 1997 as well as awards for actors Bebe Neuwirth and James Naughton, director Walter Bobbie, lighting designer Ken Billington and choreographer Ann Reinking. The original production was directed and choreographed by the late Bob Fosse.

The Ambassador Theatre is located at 219 West 49th Street. Visit www.ChicagoTheMusical.com for more information.