This is going to be R&B week on Idol. [lastfm]Diddy [/lastfm]will perform on American Idol on Wednesday night. Diddy will be doing Hello, Good Morning from his upcoming album, Last Train to Paris and the song features [lastfm]T.I.[/lastfm] and the celebrity mentor this week will be [lastfm]Usher[/lastfm]. No word yet on whether or T.I. will perform with Diddy or not on the show. If so? It will be T.I.’s first appearance in public since his release this month.