According to Pulse of Radio:
Reports say that Diddy was in talks to be the third judge on season 13 on American Idol, but turned it down because of his ex Jennifer Lopez. According to US Weekly, a source said that after Jennifer officially signed on to come back to the show, Diddy turned it down because he didn’t want to work with her and because of his history with Jennifer’s manager Benny Medina — who used to managed Diddy.
The source said that Diddy ultimately “felt it was a ‘her or me’ situation.” So, producers went with Jennifer instead.
Diddy’s rep told the magazine that it is “not true” that he turned down the gig because of J. Lo.
Kanye West also reportedly turned down the chance to be a judge on Idol this season, because he was worry that it would ruin his reputation.
Either Diddy or Kanye would have been interesting.