When news of Lily Allen and Liam Gallagher's alleged 'mile high romp' back in the day first broke earlier this year, many were shocked by the pairing of the seemingly incompatible duo.

According to the pop star, the deed took place when they were both on their way to the FujiRocks festival in Japan back in 2009, which led Gallagher's ex-wife Nicole Appleton to send an ominous threat to Allen on Twitter.

Now - despite at first claiming that she had 'never mentioned it' - Allen has confirmed that the tryst did take place as an excerpt of her forthcoming memoir 'My Thoughts Exactly' was seen by The Sun newspaper.

It read: "‘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.  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”."

Allen claims that she wasn't aware that he and Appleton were married at the time, until he mentioned it the next day. "‘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 also revealed in the book that Gallagher has asked her to lie about the incident. ‘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 bollocks.”‘

She continued: "‘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.’"

Oops.

Gallagher has yet to respond or comment on this whole matter, which is unusual for him, to say the least...