Gay Porn Star Takes Credit for Alleged Stevie J Image in Diddy Lawsuit

Diddy was accused of sharing a sex tape that allegedly showed Stevie J with another man -- but a gay porn star is coming forward to say it's actually him seen in the now-viral image.

The photos that have been circulating online -- which show a Black man apparently having sex with another guy, and who was purported to be Stevie -- were included in Rodney Jones' lawsuit against Diddy that he filed Monday ... but adult film star Knockout is taking credit.

Knockout hopped on Twitter -- this amid mass sharing of the image and a lot of gossip/speculation about Stevie's name being invoked -- and he cleared the air definitively.

He wrote, "This is not him it's me yall really be trying it." Knockout has also been reposting/retweeting people responding to the images ... all of whom are pointing out this is from a well-known porno he was in from years ago, and which has been around for a while.

Knockout has also clarified that he was NOT at any of Diddy's parties -- as described in the lawsuit -- and he also adds that he doesn't appreciate Rodney using his image to make a salacious claim. He also retweeted someone who claims this image of Knockout has often been used to try and smear Stevie's name ... something Knockout appears to acknowledge.

Remember ... Rodney claimed in his suit that Diddy had shared this video with him and allegedly said it depicted Stevie -- with the whole point of this allegedly being Diddy attempting to "groom" Rodney ... something Diddy has come out and vehemently denied.

Stevie J, for his part, has also denied Rodney's allegations ... calling them false. He also seemed to allude to future legal action against him for roping him into this whole mess.