Diane Alexander was the second ex-wife of Lionel Richie. She appeared one time in the show during an anecdote, when Robert compared Luna to Lionel's previous ex-wife Brenda Harvey.
She was shown with Lionel Richie in their hotel room. She was in her underwear in "cowgirl" position on top of a naked Lionel Richie. They were having sex until Brenda broke in and attacked them both.