The 27-year-old was exposed by a Twitter account that specialises in ‘personal’ footage of celebrities.
It posted a snap that allegedly showed former TOWIE star Kirk performing a sex act on himself.
Kirk is wearing only a baseball cap in the video, and it’s not the first time he’s been in this situation.
In 2013 similar clip leaked online and Kirk was forced to defend himself.
He tweeted: “F*****ck!!!! People these days!!!! Cooooome oooonnn guys we have all done it I’m just the stupid one that got caught! Sorry guys [sic].”
But we’re sure Kirk isn’t too bothered by the new footage: he regularly shares semi-naked selfies on Instagram and he previously admitted he loves showing his body off.
He told Attitude magazine in 2014: “Since those pictures came out of me on Skype last year I’ve become pretty much a natural in front of the camera when I’m naked.
And what’s Kirk’s favourite part of his body? His shoulders. “They’re what I feel are my best feature,” he told the magazine.
“My belly fluctuates; one minute I’ve got a six-pack and the next I’m a bit bloated, so that’s never been my best feature.”