Billy Crystal is paying tribute to his friend Rob Reiner four months after his death . While appearing on "The Late Show with Stephen Colbert" on April 14, the actor, 78, choked up as he recalled spending time with Reiner at Conan O’Brien’s Christmas party before his death . "We had spent the night before together, talking about our careers together," he shared, recalling how the pair met while working together on the sitcom “All in the Family” in 1975. "We were talking about the movie business