This Thanksgiving, gather around for some turkey, mashed potatoes, and Lady Gaga. The pop superstar will celebrate the holiday with her closest family and friends on ABC’s “A Very Gaga Thanksgiving.” During the 90-minute special, viewers will see her perform her biggest hits, duet with Tony Bennett, cook up a Thanksgiving feast, and sit down for an interview with Katie Couric at her alma-mater, Sacred Heart Catholic School in Manhattan. Gobble up some Gaga on Thursday at 9:30 p.m.