Lulu claims her late former husband Maurice Gibb potentially fathered a child with another woman during their six-year marriage.
The Scottish star made the astonishing claim while appearing on the latest instalment of The Louis Theroux Podcast, during which she discussed her marriage to the Bee Gees star and subsequent romances with pop legend and hair stylist John Frieda.
Lulu, 77, whose marriage to Gibb officially ended in 1975 without the couple conceiving a child, told Theroux she had 'just found out' and had irrefutable proof that the musician secretly fathered a son following a brief fling.
'I think he's got a son,' she said. 'It might have happened when we were married. I just found out.
'Someone showed me something and I can't remember the year he impregnated this girl after a one night stand and he has a son who has had his genes taken. It's proven. He's a hundred percent Maurice’s.'
Gibb, who died in 2003 after suffering a cardiac arrest at his Miami home, has two known children, daughter Samantha and son Adam, with his second wife, Yvonne Spenceley.
Lulu claims her late former husband Maurice Gibb potentially fathered a child with another woman during their six-year marriage
But while she remains adamant that the musician fathered an illegitimate son, Lulu told Theroux she hadn't confirmed when he was born 'because it wasn't that important.'
The singer also claimed age and experience had taught her to maintain a positive outlook.
'I think I used to take myself way too seriously,' she told Theroux. 'I know you're surprised at that, but it's true, I think.
'And it's painful when you take yourself too seriously or when you see the world black and white because there are many grey areas and I've learned through trial and tribulation.
'You know, I've had unbelievable highs, but I've also had a lot of lows, which most people have in their life. For God's sake, I'm no different to anybody else in that respect.
'So I've looked at it, I've wanted to know why. I'm always curious and I think that's probably helped me to survive all the ups and the downs in my life.'
, Lulu would embark on a relationship with celebrity stylist John Frieda - but the romance would be tested by a short lived affair with David Bowie, then at the peak of his powers as one of the defining artists of the 1970s.
'I had a brief relationship with him, we had a fling,' she said of her connection to Bowie, admitting Frieda "knew, and it was an issue."'
She would reunite with Gibb onstage in 2002, a year before his death, after inviting her ex-husband to perform on her star-studded TV special, An Audience With... Lulu.
Lulu's whose marriage to Gibb officially ended in 1975 without the couple conceiving a child (pictured together in 1969)
The couple married at Gerrards Cross Church in Buckinghamshire on 18 February 1969 (pictured)
Gibb, who died in 2003 after suffering a cardiac arrest at his Miami home, has two known children, daughter Samantha and son Adam, with his second wife, Yvonne Spenceley (pictured with Yvonne and Adam in 1979)
'I sort of knew in my heart that he would probably jump and he did,' she recalled. 'But Maurice was a very sweet guy though. You know I didn't want to use him, but I was using him. You know what, now I'm glad because it touched people's hearts.
'They saw a vulnerable side in him and I and in our relationship. It was also a chance for me to honour Maurice by himself without his brothers. And now I'm so glad I got to do that.'
She added: 'You know, sometimes in ending a relationship, you don't say all that you wanted to say or you don't explain yourself, or there's confusion or there's misunderstandings. It seemed to close the circle.
'He was very pleased because he always felt the lesser of the three. And him being on the show by himself with me, gave him respect, you know, it was respectful.'
The full interview is available to watch on The Louis Theroux Podcast, out now.
