A soon-to-be-married man was filmed apparently romping with a woman at 32,000 feet in front of horrified passengers while his heavily pregnant fiancée was at home.

Footage of Shaun Edmondson, 31, straddled by the mystery blonde during a Ryanair flight to Ibiza went viral on Friday.

Onlookers assumed the pair were just a boozed-up couple, but The Sun can reveal Edmondson was actually in the middle of his bachelor party with friends when his raunchy antics shocked onlookers.

Passengers described how the woman took her pants off before Edmondson asked: “Anyone got any jelly [condom],” and they began romping mid-flight.

Edmondson, a sous chef whose family owns fancy restaurants, faced a grilling from fiancée Jenna Ross, 25, when he returned from the party island.

A friend said: “He is known as a bit of a ladies’ man. That’s just a random woman he’s with, they didn’t know each other before the day.”

“Shaun and Jenna are due to marry soon but that clearly won’t stop him.”

“He doesn’t seem to be too bothered he has left his six-months-pregnant wife-to-be at home while he cavorts with random strangers.”

“I wouldn’t like to be him when she finds out.”

Cellphone footage shot by fellow passengers shows the mystery blonde, who was believed to be a part of a bachelorette party, sitting on Edmondson’s lap and gyrating.

Wearing skimpy shorts, she holds his hands down by her side as she appears to kiss him on the neck and rocks backward and forward.

Some fellow passengers are seen laughing at the shameless display, which happened on a flight from Manchester, England.

Edmondson works as a sous chef at posh Lyth Valley Country Inn in Kendal, England, which is owned by his family.

Pals say Edmondson’s fiancée, Ross, who was born in Canada and has been with Edmondson for six years, is aware of the footage and is fuming at his behavior.

His stepdad, Graham Oliver, 52, said: “I’ve seen the video but I haven’t spoken to Shaun about it yet.”

“I haven’t a clue whether he’s in trouble over it or not.”

Describing the scene, fellow passenger Kieran Williams, 21, previously said: “I heard them talking about it but I thought they were joking. The guy was shouting, ‘Anyone got a jelly?’”

“We all laughed, but then 10 minutes later, they actually did it. They seemed so drunk, they brought a lot of attention to themselves.”

“You could see the girl taking off her pants and he pulled his trousers off. She started riding him.”

“I had to get my phone out. I have never seen anything like that.”

A female passenger who was sitting next to the pair asked to be moved as she was so uncomfortable with their behavior.

But Williams claimed the crew did not intervene to stop or even reprimand them.

He said: “A woman was sat next to them and she stood up and asked if she could be moved.”

“About 20 minutes after it happened, someone complained about it. But the crew did nothing.”

“They were starting and stopping but it was completely obvious what was going on. We all had a good laugh about it. It was pretty funny.”

After the footage went viral, Ryanair said: “We are looking into this matter.”

“We will not tolerate unruly, disruptive or inappropriate behavior at any time and any passengers who appear to behave in an unacceptable manner may be liable for further sanctions.”