Liam Gallagher's girlfriend Debbie Gwyther is seen for the first time since Oasis' reunion announcement as she supports musician at boxing match

Liam Gallagher 's girlfriend Debbie Gwyther was seen for the first time since Oasis' reunion announcement on Saturday night.

The film producer, 40, was seen arriving at Anthony Joshua 's boxing match against Daniel Dubois at Wembley in London with the hitmaker, 52, to support him.

Debbie Gwyther has been credited with orchestrating the Oasis reunion with his brother Noel using peacekeeping skills worthy of the UN in recent weeks.

The previously warring brothers are getting back together for a series of concerts next summer which delighted fans when it was announced.

Debbie looked stylish in a black leather jacket for the boxing event and wore her dark tresses in loose waves over her shoulders.

She walked into the arena beside Liam for the show and the pair looked in good spirits together.

The person behind the exciting reunion has been reported to be Debbie - Liam's girlfriend of ten years who is also his manager.

Not only has Debbie got Liam – who proposed to her on Italy's Amalfi coast in 2019 – sober but, according to a close source, she was fundamental in orchestrating the Oasis reunion.

One friend told The Mail On Sunday: 'You need to be a hell of a strong character to have any sort of hold over him.

'Loads of people have tried and failed, but he loves her and knows how much of a positive difference she has made to his life.' Put simply: 'She doesn't take any s***.'

While the 'brilliant businesswoman' has played hardball with international promoters Live Nation and SJM, as well as with Noel's team, her biggest feat of negotiation has been between the two brothers.

'Debbie came into the scene after the band had split up, and was a fresh pair of eyes and a cooler head without all the baggage,' said a source.

'Debbie blew everyone away. Let's just say if it wasn't for her, things would not have gone anywhere near as smoothly as they did in the end.

'She was determined to get Liam back on stage with his brother.

'She's said for years she thinks they should try to patch things up – and she loves Liam's family, especially his mum, Peggy, and wanted them to smooth things over for her, too. It's hard to imagine this ever having happened without her. She should work for the UN with those skills.'

Debbie was a working-class girl, growing up in Stevenage, Hertfordshire, the daughter of a postman and stay-at-home mum.

She didn't go to university but instead moved to Dalston, East London, in her late teens to find a job in the music industry.

Debbie met Liam when she worked as his personal assistant in 2013 – after taking a job with his then management company Quest, run by Paul McCartney's manager Scott Rodger.

The pair began a relationship after he divorced All Saints singer Nicole Appleton in 2014.

He has said that Debbie introduced him to 'a whole new world' beyond his comfort zone of Primrose Hill in North London where he had lived during his marriages to Ms Appleton and actress Patsy Kensit.

It is also where he brought up two of his children, sons Lennon, 24, and Gene, 23, whose mother is Patsy.

Liam admits that Debbie 'saved' him. He said: 'Debbie swooped me up as I was falling. She just said, 'Stop being a d***head.'

'She got me out of the house, introduced me to all kinds of people outside my world, got me doing new things. I've lived in London a long time, but I only really knew Hampstead.'

He added: 'She was a breath of fresh air, man. She sorted me right out. Me and her like to do the same things. We like having a laugh. I've met my match, I've met my soulmate. It's good because the kids love her, the lads love her.'

But Debbie hasn't always been known for her hard-nosed sobriety. She and her sister Katie, who also works in the music business and helps manage Liam's career, had reputations as party girls when they emerged on London's rock 'n' roll scene.

They ran a public relations company, Fear PR, and were regulars at gigs. Debbie and Katie often had late-night drinking sessions in grungy venues but, it is said, few could outmatch their staying power.

'They were a pretty wild pair when they wanted to be,' one insider admitted. 'But they have calmed down now.'

As well as owning a £4 million home down the road, Debbie and Liam moved to a manor house near Stroud in the Cotswolds this year.

They are understood to be renting the property for £17,000-a-month. The move, say friends, is another part of the 'New Liam'.

Less time is spent propping up the bar of their London local, The Flask, and instead the couple are seen walking their dog on a nearby common. Liam sets his alarm for 5am for an early-morning run.

In his pre-Debbie years, he would have still been partying at that hour, pals point out. Debbie – whose Lake Como wedding to Liam last year was postponed when he had hip surgery – once said: 'The Liam I know and the Liam in the public eye are totally different. He's impulsive, and he swears a lot, but that doesn't mean you can't be soft at the same time.

'He has a lot of onus on family. The way he is with me, the way he is with my family, his kids and his mum is the reason that I love him. I knew he would never be happy unless he was singing.'

That said, things haven't always been easy.

In 2018, Liam was pictured appearing to assault Debbie in an ugly late-night incident at London's celeb honeytrap Chiltern Firehouse.

CCTV footage showed Liam appearing to place his hands on her neck in a boozy row, prompting later questions from the police, but the pair fiercely denied anything malicious, with Debbie angry that the images were published.

As one source later put it: 'They're used to fiery moments – it's their world.

'What looks horrifying to some people felt different to them, and they dealt with it themselves.'

Now, there are fewer fiery moments in their lives. In fact, Liam has 'wonderful' relationships with all of his children. He was estranged from his eldest, daughter Molly, 26, from a brief fling he had with model Lisa Moorish while he was married to Ms Kensit.

'That was Debbie, too,' says a friend. 'She knows what's best for Liam and he listens.' Let's hope her peacekeeping skills last through next year's sell-out tour.