On Gilmore Girls (8 p.m., WB), Emily banishes Lorelai from Christmas dinner but invites Rory. Karen's porn past is revealed on a rerun of Will & Grace (9 p.m., NBC). Investigative Reports (10 p.m., A&E) looks at "The Danger on Our Plates" in the form of E. coli contamination in meat and other food-borne bacterial outbreaks. Dan Rather gets all sensitive on us as 48 Hours (10 p.m., CBS) looks at inspiring tales of forgiveness.
Ellen DeGeneres, Amy Brenneman, Faith Hill, Destiny's Child and Muhammad Ali are among the celebrities on hand to pay tribute to adoptees and their parents on A Home for the Holidays (8 p.m., CBS). In the spirit of the season, Feuds 2000 (10 p.m., VH1) looks back at all the stars who brightened our days with their public displays of animosity toward one another.
Celtics at Knicks (8 p.m., TNT)
David Letterman (CBS) Juliette Binoche, John Witherspoon
Jay Leno (NBC) Cate Blanchett, William H. Macy, Seal
Politically Incorrect (ABC) Penn Jillette, Tiffany (rerun)
Conan O'Brien (NBC) Jerry Springer
Craig Kilborn (CBS) Bill Paxton, Katherine Heigl
All times Eastern unless noted.