Liam Gallagher and Lily Allen enjoyed a mammoth drinking session during an 11-hour flight to Japan. The Oasis frontman - who had been drinking champagne in the Upper Class lounge at London's Heathrow airport ahead of boarding the Virgin Atlantic flight last Wednesday - and the "Fear" singer spent most of their time on board drinking together, despite the best efforts of their entourage, who had warned cabin crew as they boarded to "keep those two apart."

A source told Britain's The Sun newspaper: "They did not care about the other passengers. They were in a world of their own."

"They were already well-oiled by the time they came on board. There is obviously a different set of rules for celebrities."

Staff on the plane allegedly had to repeatedly tell the duo to "calm down" and stop swearing.

Following the flight, the pop star pair continued their fun as they touched down in Japan - where Oasis and Lily were performing at the Fuji Rocks festival.

Liam later admitted the trip had been a good one, writing on his Twitter page: "Just landed in Tokyo. That flight flew by."

Lily used her page on the social networking website to say: "At Lost in Transation hotel in tokyo. Had an extraordinary amount of fun the past few days, and now ive got 2 weeks off. EPIC."

Liam, 36, has a history of drunken behavior on planes.

In 1998, he was banned from Cathay Pacific airlines for life after passengers on a Hong Kong to Perth flight complained about his drunken and offensive behavior, which was reported to include smoking, swearing and throwing objects at staff.

Liam - who had been threatened by the captain that he would be arrested upon landing - later claimed he had done nothing wrong and had only wanted "a scone."

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