Prince

Prince Rogers Nelson, simply known as Prince was an american singer, musician, songwriter and actor. He appeared as himself during the Treehouse of Horror XIX segment "How to Get Ahead in Dead-Vertising" and almost guest starred in a canceled episode.

History
During Treehouse of Horror XIX, Prince was one of the celebrities killed by Homer so they could be used for free in commercials. Homer choked, stabbed and beat him with his own guitar. He's later seen on a grass seed advertising.

"The Prince Episode"
Prince was going to appear on a sequel to the episode Stark Raving Dad, however, he was going to voice Leon Kompowsky, who now would think he's Prince. His producers even contacted the writers to settle the episode's details, but the writetrs soon found out that there were two completely different scripts. Eventually, the idea for such episode was scrapped.