Gaga and Jim Carrey’s real estate hunters Tom Postilio and Mickey Conlon invited Christine Ebersole and David Hyde Pierce to a party. Nice but nobody got in. The joint was shut . . . Katie Couric’s deal is one more year. Stations assembled for her program are returning to ABC’s affiliates . . . America Ferrera, who always says nice things, raving to whoever’ll listen about “A Gentleman’s Guide to Love and Murder.” Calls it “freaking hilarious.”