Liam Gallagher has blasted his brother Noel for his 'fake' appearance at the We Are Manchester fundraising concert on Saturday night.

The rocker, 44, took to Twitter after the gig to call the performance a 'PR stunt', and claim his brother 'does not give a f***' - after he was seen breaking down in tears onstage during his rendition of Don't Look Back In Anger.

Not stopping there, the Beady Eye frontman then went on to slam his rival brother's second wife Sara MacDonald - claiming in rage she was simply a 'sh*t Meg Matthews', who Noel divorced in 2001.

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'He doesn't give a f***': Liam Gallagher has blasted his brother Noel for his 'fake' appearance at the We Are Manchester concert on Saturday night

Heartbroken: The rocker, 44, took to Twitter to slam his brother's performance as a 'PR stunt' - after he was seen breaking down during his rendition of Don't Look Back In Anger (above)

Smile and wave: Noel was seen cutting a cheery expression as he left his hotel in Manchester on Sunday, following his brother's claims

A representative for Noel Gallagher has been contacted by MailOnline for comment.

Noel performed alongside the High Flying Birds at Saturday night's gig, which marked Manchester Arena's first event following the tragic bombing that killed 23 in May.

Belting out a string of Oasis hits, the singer, 50, was seen breaking down during his performance of Don't Look Back In Anger - a song which quickly became an anthem of defiance in the days after the attack.

Addressing the 14,000-strong crowd beforehand, he said through tears: 'Every time you sing, we win. So sing like you've never sang before.'

Doing his bit: Noel performed alongside the High Flying Birds at the gig (above), which marked Manchester Arena's first event following the tragic bombing which killed 23 in May

Not impressed: Noel's brother and long-term rival Liam however immediately took to Twitter to call his performance a sham, and claimed his tears were 'fake'

However, despite his emotional appearance, his brother and long-term rival Liam immediately took to Twitter to blast his performance as a sham.

Suggesting his sibling's tears were fake, Liam wrote furiously to fans: 'NG broke down in tears cmon you seriously ain't buying that he doesn't give a f***' (sic)

Having blasted Noel for not joining him at the One Love Manchester fundraiser earlier this year, Liam went on in rage: 'Don't buy into his PR stunt he doesn't give a f***', before adding: 'If the same thing had have gone of in Edinburgh he'd been up there like a shot ahem.'

The latter was no doubt a dig towards Noel's second wife Sara MacDonald, who he married in 2011, and hails from Scotland.

Furious: Liam went on the angrily blast Noel's wife Sara MacDonald - and insinuate she was a second-rate version of his first wife Meg Matthews

Rivals: He warned the Scottish PR girl (above) to 'not come after him', before adding scathingly: 'Your just a sh*t meg as you were LG x'

In the past: Noel and Meg (above) divorced in 2001 on the grounds of his adultery with PR girl Sara, although the rocker later denied this

Clearly still at loggerheads with the couple, following his original fallout with Noel in 2009, Liam went on the angrily blast Sara - and insinuate she was a second-rate version of his first wife Meg Matthews.

He added: 'Sara what ever your name is don't ever come for me esp with Jeff silly stupid hair cut as you'll get put down as you were LG'

Before adding scathingly: 'Your just a s**t meg as you were LG x'

Noel and Meg divorced in 2001 on the grounds of his adultery with PR girl Sara, although the rocker later denied this and revealed he went along with the cheating accusations to speed up their separation.

Flying solo: While Noel was performing in Manchester, Liam was headlining the DCODE Festival in Madrid, Spain (above)

'6 months too late': In one last blow, Liam then replied to a fan who was quick to praise Noel for his heartfelt performance at the charity gig

In one last blow, Liam then replied to a fan who was quick to praise Noel for his heartfelt performance at the charity gig.

Responding to a follower who wrote: 'Btw your brother smashed the Manchester Concert tonight x', Liam slammed Noel for not joining him onstage at the One Love gig in June, writing: 'Corse he did about a 6 months too late as you were' (sic)

Liam had taken to the stage alone at Ariana's fundraising gig earlier this summer -and had been quick to criticise Noel then, for not joining him for an Oasis reunion onstage.

At the time, the Wonderwall hitmaker had called his brother a 'sad f***', and said: 'He's made it clear that a reunion is not at the top of his priorities and right now it's not the top of mine.

Independent: Liam had taken to the stage alone at Ariana's fundraising gig in June (above) -and had been quick to criticise Noel then, for not joining him for an Oasis reunion onstage

At loggerheads: Liam and Noel have clashed for years, splitting up as Oasis in 2009 when Noel claimed he simply could not work with his brother 'a day longer'

'I would prefer it if I was in Oasis, but that's not what the Manchester concert was about. He could have got up and done Don't Look Back in Anger and never even had to see me.

'Are you telling me that if Noel Gallagher rocked up with his guitar and knocked on the door they would say, 'You're not invited, mate?' So he can f**k off on that one.

'I don't care if he was in the Amalfi Coast or wherever, it lacked sympathy on his behalf. We have family and friends in Manchester and me mam's still there, and it would have been nice to do it for his people. End of.'

The Mancunian brothers have been estranged since 2009, enduring a number of rows during their time in Oasis before the band finally split that year.

Unbearable: Following the split of Oasis, Noel said of his brother (above): 'People will write and say what they like, but I simply could not go on working with Liam a day longer'

Noel admitted in a statement at the time: 'It is with some sadness and great relief [...] I quit Oasis tonight.

'People will write and say what they like, but I simply could not go on working with Liam a day longer.'

However, Liam did recently hint at future reconciliation between the pair - admitting they had 'unfinished business' to sort, but that he is still fond of his brother.

Speaking to BBC Radio One, he said: 'Everyone knows I love our kid. He doesn't speak to me, we don't speak to each other.

'I'll speak to him some day. It's all very sad, but we'll get over it… I guess it musn't be nice for my mum… If Oasis ever got back together… if they do, they do. If they don't, they don't.

Reunion: However, Liam (R) recently hinted at a future reconciliation - admitting they had 'unfinished business', but that he is still fond of his brother (pictured in 2001)

Moving on: Liam told BBC Radio One: 'Everyone knows I love our kid. He doesn't speak to me, we don't speak to each other. 'I'll speak to him some day. It's all very sad, but we'll get over it'

'A lot of people go, 'Oh, leave it in the past, you were great then'. Mate, if we ever got back together, it would be happening. There'd be no dodgy gigs, it'd be bang on. So there is unfinished business there, but we'll see what happens. In the meantime, we're two little solo boys doing our little things.'

Meanwhile Noel was joined by local acts including Blossoms, The Courteeners and Rick Astley for the We Are Manchester gig - the first show at the venue following the terrorist attack at Ariana Grande's concert on May 22, which saw 22 people killed and 250 injured.

It is only fitting that the rocker performed, as Oasis' 1996 hit Don't Look Back in Anger has become an anthem for the Northern city in the wake of the horrific terrorist bombing.

All proceeds made from ticket sales will be donated to the Manchester Memorial Fund, which has been set up to fund a memorial in tribute of the people who tragically lost their lives in the attack.