EXCLUSIVE: Morgan Freeman is in negotiations to join the cast of Last Vegas. The film, which already has Michael Douglas and Robert De Niro on board, is about four friends of retirement age who reunite in Sin City for one last blowout at the bachelor party of the only one of the pals who has stayed single. Jon Turtletaub will direct. Laurence Mark and Amy Baer are producing with CBS Films and Joe Drake and Nathan Kahane’s newly announced Good Universe. Kahane and Nicole Brown will executive produce. Matt Leonetti is co-producing. Morgan Freeman is repped by CAA.