Lorne Michaels

Rihanna was a no-show for her final rehearsal for "Saturday Night Live" last night -- which did not sit well with the show's producers, including head man Lorne Michaels ... TMZ has learned. According to our sources, RiRi called in sick for the dress rehearsal, which is done live in front of a…

Lindsay Lohan has fired off a letter to "Saturday Night Live" honcho Lorne Michaels -- explaining she was disappointed with him for allowing Miley Cyrus to take digs at her on the show ... TMZ has learned. Sources close to Lindsay tell us ... she had considered Lorne a mentor and a father figure…