Titled Johnny T's Christmas Spectacular, the one-night-only event will be held Dec. 20 at the famed jazz club Birdland on West 44th Street. Tartaglia, who portrays Rod and Princeton in the Tony-winning musical at the Golden Theatre, told Playbill On-Line, "It'll be a really fun Xmas show with special guests and silliness. We're still working out all the details!" Show time is 7 PM.

John Tartaglia is currently making his Broadway debut in Avenue Q. He received a Tony nomination, a Theatre World Award and the Clarence Derwent Award for that performance. The young actor also appeared in the Children of Eden and Hair benefit concerts and in the City Center Encores! presentation of Carnival. His TV credits include eight seasons on "Sesame Street" as well as "Animal Jam," "Bear in the Big Blue House," "Queer Eye for the Straight Guy" and "The Rosie O'Donnell Show." Tartaglia was recently seen in the Empty-Handed concerts at the Lucille Lortel Theatre and has performed solo evenings at the Ars Nova and Joe's Pub.

Birdland is located in Manhattan at 314 West 44th Street. For reservations, call (212) 581-3080.