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He's been at loggerheads with his brother Noel Gallagher for several years, most recently stating his desire to 'break his jaw' in a spat over the use of Oasis songs.
And Liam Gallagher found himself on the receiving end of a vitriolic outburst over the weekend, when Noel's wife Sara Macdonald branded him a 'fat t**t' and 'dated tribute act in an online rant ahead of his Saturday night performance at Glastonbury.
Friday - Night - Sara - Instagram - Account
On Friday night, Sara took to her private Instagram account to praise the day's headliner Stormzy, before answering a follower's enquiry on whether she'd be staying at the festival to watch brother-in-law Liam take the stage the following day.
Showing she's not one for mincing words, she responded: 'Think I’m going to swerve that. The fat t**t doing his tribute act, balancing a tambourine on his head is going to look pretty dated after Stormzy.'
Screenshot - Exchange - Internet - Fuel - Stars
A screenshot of the exchange has since been widely circulated on the internet, likely adding more fuel to the stars' seemingly endless feud.
MailOnline has contacted representatives for Liam and Noel Gallagher for comment.
Lack - Support - Brother - Liam - Eyes
Despite the lack of support from his brother, Liam ensured all eyes were on him as he took to Glastonbury's Pyramid Stage on Saturday, with his girlfriend Debbie Gwyther and daughter Molly Moorish watching on from backstage.
The rocker appeared ready for action as he kickstarted the headline set just before The Killers with his 1994 hit Rock 'N' Roll Star.
Signature - Maracas - Pair - Finlay - Sunglasses
Armed with his signature maracas and a pair of Finlay sunglasses, the musician was every inch the showman as his distinct voice erupted across the fields.
Also spotted among the masses was Liam's son Lennon Gallagher, 19, as he supported his father backstage.
Month - Liam - Brother - Oasis - Bandmate
Last month, Liam proved to be fuming as he hit out at his brother and former Oasis bandmate for banning his own band's...
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