Who sings the new adventures of old Christine theme song?

My concert-pianist wife claims I have perfect "voice-pitch" (I can identify people's voices well).

And, I'd swear it sounds like Wanda Sykes, herself (New Christine's co-star, "Barb").

Listen to it here, and see what you think.

http://www.televisiontunes.com/New_Adventures_of_Old_Christine_%28The%29.html

But, can't find anything on her doing any singing.

Did a fairly extensive Web-search on all this. Nada. Why are they keeping this a secret??

It is Julia Louis herself! Don't you remember she had the short lived sit com where she was a night club singer...she did all the singing there too. She rocks!