Guest Stars, Kristen Bell, Matt LeBlanc and more

— Guest stars are taking over NBC’s comedy block tonight. Jack Black appears on Community as a fellow student who tries to get into the study group. Will Arnett and Justin Theroux drop by Parks & Recreation and James Franco appears on 30 Rock.

— This whole NBC Late Night mess is actually helping Conan O’Brien. Tuesday’s Tonight Show gained 42% more viewers between the ages of 18 and 49 compared to Monday’s show. This increase came after CoCo rejected NBC’s offer to move the show to after midnight. If only these “devout” fans watched the show before the chaos.

— Oh no, now there’s a crazy rumor that the evil Jeff Zucker will take Conan off the air for three and a half year after next week.

— The post-Leno slot: the original Law & Order (Mondays, beginning Mar. 8th), Parenthood (Tuesdays, as of Mar. 2nd), Law & Order: Special Victims Unit (Wednesdays, as of Mar. 3rd), Jerry Seinfeld’s The Marriage Ref (Thursdays, as of Mar. 4th; special sneak preview on Feb. 28th) and an extended Dateline NBC on Fridays (as of Mar. 5th).

— Friday Night Lights returns to NBC on April 30th.

— Leven Rambin’s Grey’s Anatomy / Private Practice crossover airs tonight.

— Kristen Bell and Josh Duhamel will be presenters at the Grammy Awards on Jan. 31st click here for more. Their flick, When It Rome hits theatres on Jan. 29th.

— Judy Greer will guest star on an upcoming episode of Modern Family. She’ll play Denise, Phil’s ex-girlfriend who reconnects with him on Facebook.

— CBS has renewed The Good Wife for a second season (my mom is so happy about this). NCIS: LA will also be back.

— Kiefer Sutherland wore a dress on Late Show with David Letterman last night (he lost a bet). I’ve just received access to the four-hour 24 season premiere extravaganza. Will fill you all in on season eight this Saturday.

— By now you’ve all seen that photo of Matt LeBlanc looking like an old man but here’s a clip of his upcoming Showtime series, Episodes where he plays himself. The show is about a British couple whose hit UK television show is dumbed down as an American sitcom.