Selena Gomez says she's never done the nasty with Orlando Bloom ... and she has absolutely zero to do with his raging battle against her ex-BF Justin Bieber.
Sources directly connected to Selena tell us ... the reason she was with Orlando back in March is because their manager organized an event for his clients at We Day in Oakland.
As for the widely-circulated photo of Orlando and Selena at a Chelsea Handler show in L.A. a few weeks later ... it was nothing more than a smoke break. They were actually with their respective groups of friends and happened to be next to each other when the pic was snapped.
And here's Orlando's speech at the same event.