Lily Allen Reveals She Had Sex With Then-Married Liam Gallagher In Airplane Toilets

She detailed the tryst in her new book.

Lily Allen has been dropping bombshells left right and centre while on the promo trail for her book My Thoughts Exactly -- and her latest revelation is a doozy.

According to one particularly juicy excerpt taken from her book, the 33-year-old reveals that she slept with Oasis singer Liam Gallagher in 2009 during a flight to Japan -- while he was still married to All Saints singer Nicola Appleton.

"We got hammered on the plane. At some point, Liam and I found ourselves together in the toilet doing something that he shouldn’t have been doing, and it wasn’t drugs. Then we were in a lie-down bed together," she wrote.

"When we landed in Tokyo, Liam said, in his distinctive nasal twang, 'What you doing now? Why don't you come back to our hotel…' I was like, 'Yeah, OK.'"

READ MORE: Lily Allen Relives Getting Carried Out Of Awards Show After Accidentally Snorting Ketamine

"It wasn’t until the next day when he said something like, 'No one can hear about this because of Nic,' that I clocked he was married. I knew Noel was married and I knew Liam had been married to Patsy Kensit. That was partly why I fancied him. I'd grown up an Oasis fan. I was 12 when he and Patsy Kensit were on the cover of Vanity Fair as the coolest couple," she added.

Liam Gallagher and Nicole Appleton in 2010. Image: Getty

She also said that months after their mile-high romp, Gallagher called her begging her to tell his wife that their toilet tryst never happened.

"Six months later I was in my car with my driver when the phone rang… It was Liam," she wrote.

"He sounded awful, like he'd been up all night. 'Lil,' he said. 'I just need you to get on the phone. I've got Nic here. One of your mates is, like, trying to do a wind-up or something and saying that you and me had it off or whatever, and I need you to speak to Nic and say that it's all bullocks.'"

Lily replied, “Oh, Liam, yes sure, it’s all bollocks. Let’s say it’s all bollocks -- of course, I’ll tell Nicole that it’s all bollocks if that’s what you want -- and not think about it too much or even at all, and then maybe it will go away and not disrupt what really matters: The people we love and rely on.”

Gallagher and Appleton dissolved their marriage 2014 after it came out that he had fathered a child with American journo Liza Ghorbani.

In April this year, Appleton took aim at Allen in the form of a tweet, simply saying, “One day our paths will cross @lilyallen!”

Lily Allen's tell-all book My Thoughts Exactly is set for release October 20.

Image: Getty