At the 9:30 PM concert, Thompson is joined by John Ambrosino (Jersey Boys), Ben Cameron (Wicked, Aida), Daniel Everidge (Grease, Falling), Andrew Kober (Hair), Erin Quill (Avenue Q), Julia Mattison (Godspell), MJ Rodriguez (Rent), Marissa Rosen (My Big Gay Italian Wedding), Marty Thomas (Wicked, Xanadu) Lael Van Kueren (Sister Act) and Joel Waggoner (Southern Comfort). 

According to press notes, "Katie Thompson sets her sights on Christmas, with a night of carols re-written, standards re-imagined, and New York's finest, funniest voices. Having penned three albums and two-and-a-half musicals, this 'rich-voiced powerhouse' promises to 'put the mayhem back in Bethlehem.'"

Christmas With a "K" was seen at 54 Below Dec. 3. The Duplex concert benefits Toys for Tots. 

Thompson's solo albums include "Private Page," "KT LIVE" and "What I've Done Right." Her musicals include R.R.R.E.D. a Secret Musical. For more information on the songwriter, read Playbill.com's Contemporary Musical Theatre Songwriters You Should Know.

The Duplex is located at 61 Christopher Street. There is a $20 cover charge and beverage minimum. For more information and tickets, visit TheDuplex.com or call (212) 255-5438.