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Liam Gallagher has branded Robbie Williams a "f***ing drama queen" for checking into rehab, and former bandmate Gary Barlow says Robbie will never be happy.
The Oasis frontman has blasted his rival for seeking help for his prescription drugs addiction on the eve of the BRIT Awards, and
says he only did it to be on the "f***ing front pages" of newspapers.
Speaking backstage at the BRIT Awards, Gallagher ranted: "What's his f***ing problem, man? We all know what it is – he's a f***ing drama f***ing queen. If you've got a problem why do you want the whole world to know about it? He has to be on the front f***ing pages, doesn't he? Just sort your f***ing self out man.
"If you take drugs you end up in rehab unless you're like me."
The Cigarettes and Alcohol singer - who along with the rest of Oasis picked up the Outstanding Contribution To Music award at the BRITs – believes Robbie is hooked on pills because he can't cope with the criticism levelled against his last album Rudebox.
Liam added: "You make a crap album and then you want everyone to feel f***ing sorry for you. F***ing t***er!"
Although they were briefly friends in the mid-90s, Liam and Robbie have been feuding for years since Liam's brother Noel labelled the Angels singer "the fat dancer from Take That" in 2000.
Liam is engaged to Robbie's ex-girlfriend, former All Saints singer Nicole Appleton, and the pair have a son, Gene.
Robbie checked himself into The Meadows rehab centre on Tuesday, on his 33rd birthday.
He is believed to be hooked on anti-depressant Seroxat, anti-anxiety relaxant Xanax and the painkiller Vicodin.
Meanwhile, Gary Barlow has taken a swipe at former bandmate Robbie, saying he will never be happy.
The Take That singer believes Robbie has an inherent need to feel miserable.
"There are some people who will never be happy and I fear that Robbie will be one of them," he said.
"We haven't heard from him in ages, but the boys and I hope that he is OK."
The foursome - Gary, Mark Owen, Jason Orange and Howard Donald - were accused of deliberately snubbing Robbie when they failed to mention him when they collected the award for British Single at last night's BRITs.
The boys celebrated their prize, which they received for hit song Patience, by heading to exclusive Knightsbridge restaurant Mocoto.
During the evening's festivities, Jason - who was accompanied by his father - seemed to only have eyes for fellow diner former Mis-Teeq singer Alesha Dixon.
An onlooker told Britain's Evening Standard newspaper: "She seemed pretty interested too. They were chatting for ages and were overheard trying to see when they would see one another again."
- BANG! SHOWBIZ