Diddy -- I'm NOT Bangin' Kate Upton

Sad news from the Diddy camp ... the rap mogul says he's 100%, positively NOT having sexual relations with model Kate Upton ... despite the fact it would be totally awesome if true. Reports surfaced this morning that Diddy and Double-Diddy were…

Giulianna Ramirez Grace Park Gretha Cavazzoni Gwen Stefani