Christopher Sieber, recently Rapunzel's Prince in Broadway's Into the Woods, becomes prince of a corporation when he steps into the spats of mogul Trevor Graydon in Thoroughly Modern Millie Jan. 28.

Kudisch takes a leave from the Marquis' Millie (returning April 29). For NYCO, he'll play the strutting peacock Carl-Magnus in its staging of A Little Night Music, in rep March 7-29. Scott Ellis directs and Susan Stroman choreographs, drawing on their 1990s staging for NYCO (the Stephen Sondheim-Hugh Wheeler show is now part of the company's repertoire).

In the elegant A Little Night Music, Carl-Magnus is the virile soldier who cheats on his wife, the bitter Charlotte, with the middle-aged actress, Desiree Armfeldt. Desiree pulls a ruse over on Carl-Magnus by taking as her lover the lawyer Fredrik Egermann, an old flame.

Kudisch's castmates in the limited run are Jeremy Irons (Fredrik), Juliet Stevenson (Desiree) and Kate Burton (Charlotte).

Sieber continues in Millie to April 27. The cast of the Tony Award-winning Best Musical, Millie,includes Tony Award winner Sutton Foster, Angela Christian, Harriet Harris, Ken Leung, Francis Jue, Anne L. Nathan, Gavin Creel and Sheryl Lee Ralph.

Sieber's credits include Broadway's Beauty and the Beast (Gaston), Triumph of Love and Madison Square Garden's A Christmas Carol.

As the stuffed shirt Mr. Graydon, wealthy object of desire for gold-digger Millie, Sieber gets to sing music by Victor Herbert and Arthur Sullivan, interpolated for special effect. Most of the show's score is by composer Jeanine Tesori and lyricist and co-librettist Dick Scanlan.

The Marquis Theatre is at Broadway and 46th Street. For ticket information, call (212) 307-4100.