Westlife's Brian McFadden reveals he was fat-shamed by 'horrendous' Louis Walsh and the band were forced to skip family funerals to perform

Brian McFadden recalled his 'horrendous' experience with Louis Walsh in a new documentary unveiling the dark side of Nineties boybands.

The singer, 44, soared to fame when Louis formed Westlife in 1998, but revealed he struggled with the manager's taunts and insults.

Speaking in upcoming BBC series Boybands Forever, he confessed: 'I hated Louis. Louis would walk into a room and go, "Hey everyone", and then he'd look at me and go, "Brian..." (Blowing his cheeks out). Basically saying that I'm fat.

'He was just horrendous. But very few things that he touched didn't turn to gold.'

Revealing how quickly his life changed, Brian added: 'I was working in McDonald's as a security guard and six months later Swear It Again went to No1.'

Westlife - formed of Brian, Shane Filan, Mark Feehily , Kian Egan , and Nicky Byrne - went on to become one of Ireland's most successful boybands, selling more than 55 million records.

Brian quit the band in 2004, admitting he struggled to juggle raising his children with then-wife Kerry Katona with being in the group.

As reported by The Sun , he said in the documentary: 'It was made very clear to us by the powers that be that our personal lives 100 percent came second to Westlife.

'We had times where we had relatives die and we couldn't go to the funeral because there was a gig or an interview that day.'

MailOnline has contacted Louis' representatives for comment.

The group have previously voiced their upset at Louis' behaviour during their time in the band.

Nicky Byrne once shared in a chat with The Mail : 'Louis was always on at you. The first thing he'd say when I walked in the room was: "Your teeth are fecking terrible." What did he want me to do? They were my teeth. I remember saying once: "Your teeth are fecking horrible, too."

He said: "I know but I'm not on TV." I went and got a brace.' Kian Egan added.

'We lived in fear of Louis. He was like: "You're done. I'm going to kick you out of the band. I'm going to put you on the next plane home. Only four people can fit in a taxi, not five."'

Shane Filan then impersonated the X Factor judge, saying: '"Shane, you don't look great. Your hair's terrible. You look fat. Watch yourself, there are only three Bee Gees."

'We were definitely scared of him. He was a very powerful man - only a tenth as powerful as he is now - but the best manager in the world for us.'

Louis Theroux's documentary Boybands Forever, which takes a deep dive into the careers of Nineties and Noughties acts such as Take That, Westlife and Blue, is set to hit screens on Saturday.

The three hour-long episodes will follow the life changing reality of stars finding fame at a young age and will dive into topics such as drink, drugs, bust-ups and exploitation.

Louis interviewed the likes of Robbie Williams and Brian McFadden as well as music label boss Louis Walsh.

Speaking ahead of his boyband series, Louis said: 'I couldn't be more thrilled about this series. An epic story featuring a cast of stars and star-makers, spanning three decades, it involves some of the icons of modern British pop.

'We see them through them through their highs and lows, hearing from the key players, as we chart the golden years of boybands.

'How they came together, the experience of sudden fame, the opportunity and temptations that came their way, conflicts within the groups, between the groups, and between the boys and their managers.

'It's a gripping fable about getting everything you dreamed of, and it not being what you imagined, centred on a generation of young men, and their managers, who were wildly successful and also immensely vulnerable, having the times of their lives and also in some cases cracking up.

'Those boys we all watched singing and dancing in tight formation - Take That, East 17, Westlife, Blue, Five, Damage, 911 and so many others - are now middle aged men who have the time and the maturity to look back reflect on what they went through. It's taken us more than a year to make the series.

'Now I'm just excited for people to see it.'

The first two episodes of Boybands Forever air on Saturday at 9.15pm and 10.15pm on BBC Two