Set your DVRs tonight!

NBC’s Emmy-winning series “30 Rock” will gain some clout tonight as it receives some Tony Award-winning guest stars: Patti LuPone (most recently seen in the revival Broadway of Gypsy) and John Lithgow (most recently seen in the Broadway play All My Sons) are making a special appearance.

NBC describes the show as “a workplace comedy where the workplace exists behind-the-scenes of a live variety show.”

The episode is to be entitled “Goodbye, My Friend,” and airs on NBC at 9:3o PM ET; check your local listings for any discrepancies.

The press release states:

LIZ LEMON’S (TINA FEY) BABY FEVER HEATS UP WHEN SHE BEFRIENDS A PREGNANT TEEN. PATTI LUPONE AND JOHN LITHGOW GUEST STAR –
Liz (Fey) befriends a pregnant teenaged donut shop employee, in an attempt to adopt her baby. Back on set, Jenna (Jane Krakowski) vies for more attention from the TGS staff as her birthday approaches, but Kenneth’s (Jack McBrayer) plan to combine her party with one for Tracy (Tracy Morgan) derails her efforts. Meanwhile, Jack (Alec Baldwin) agrees to go on a guys’ night out to keep his mind off of his absent girlfriend, and bonds with Frank (Judah Friedlander) over their daddy issues. Also starring Scott Adsit.

Entertainment Weekly reports that LuPone will portray the mother of the witty and wise-cracking writer Frank (played by Judah Friedlander).

No word yet on who Lithgow will be playing, but I find it humorous that he’s starring on a show with a title so similar to one he starred on several years ago: “3rd Rock from the Sun.” (I always want to say that title when I think of “30 Rock,” anyway.)

Visit the official website for “30 Rock” for more information.