Los Angeles, CA -- Valerie Harper has taped her guest shot on "Hot in Cleveland" that reunited her with many of her co-stars from "The Mary Tyler Moore Show." Harper says there were tears, but not because she has terminal brain cancer. She says they laughed so hard they cried. Harper, Mary Tyler Moore, Cloris Leachman and Georgia Engel won't be playing their old characters. Betty White will play her usual role on the sitcom. It's the first time in about 36 years that they've acted together.