From CBS' official press release:

Christine and Barb throw new Christine an impromptu bachelorette party in Vegas, where she discovers a wild side she never knew she had, on The New Adventures of Old Christine, Wednesday, January 21.

Charles Esten and Barry Alan Levine guest stars.


"What Happens In Vegas Is Disgusting In Vegas" - Typically tightened-up New Christine loses all her inhibitions at a spur-of-the-moment bachelorette party Christine and Barb throw for her in Vegas, on The New Adventures of Old Christine, Wednesday, January 21 (8:00 to 8:30pm ET/PT) on the CBS Television Network.

The New Adventures of Old Christine stars Julia Louis-Dreyfus, Clark Gregg, Hamish Linklater, Emily Rutherfurd, and Wanda Sykes.


Source: CBS
(Image courtesy of CBS)