The 32-year-old Irish MMA fighter's X-rated post was taken down from Instagram within 10 minutes of it being posted on the platform.
However, eagle-eyed Instagram followers of McGregor managed to capture a screenshot before it was taken down.
The post in question featured a sex scene from Martin Scorsese's much-loved blockbuster hit The Wolf of Wall Street.
The scene has Leonardo DiCaprio's character, Jordan Belfort, having sex with Margot Robbie's Naomi Lapaglia on a money-filled bed.
McGregor has been in a relationship with Devlin since 2008 and the pair have had two children together: Conor Jr and Croia.
The Irishman made his MMA return in January and was stopped in the second round against Dustin Poirier at UFC 257 in Abu Dhabi.
McGregor's manager Audie Attar has revealed that the 'Notorious' could face the winner of Michael Chandler vs Charles Oliveira for the lightweight title if he beats Poirier.
"I think that only makes sense," he told MMA Junkie.
"I think this truly becomes a No 1 contender fight. I think Chandler vs Oliveira happens and the winner of that faces the winner of McGregor vs Poirier 3."
Attar added that McGregor has established himself as one of the best fighters of all time, saying he has "proven to himself what he's wanted to accomplish up to this date."
McGregor's manager explained: "At this stage in Conor's career, he's proven to people that he's one of the greatest of all time.
"He's proven to himself what he's wanted to accomplish up to this date. He's such a competitor that he wants more.
"He can never fight in his life again and be so proud of himself and everything he's accomplished inside the octagon and outside the octagon as an entrepreneur and philanthropist.
"It's about trying to challenge himself as a real fighter would, and I think coming off a loss which is now square up at 1-1, it's only right to turn it around and take him on a trilogy."
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