Lily Allen said an adult celebrity who played football with her father had sex with her when she was 14-years-old.
The Smile singer said she watched the unnamed television star compete in a charity football match before he bought her drinks and had sex with her in his hotel.
Allen, now 33, said she was afraid to tell her father about the incident – but he reportedly turned it into a joke.
Lily Allen attends the Hyundai Mercury Prize 2018 at Eventim Apollo
Lily Allen breaks down in tears after narrowly missing out on the Mercury Music award
The shocking claims were made in Lily Allen’s new book My Thoughts Exactly.
She wrote: ‘After the match, the TV star left his football gear in my dad’s car, and I was dispatched to his hotel to return it.
‘We arranged to meet in the bar there. He bought me a couple of drinks, then took me up to his room and had sex with me.
‘I was 14. He was 19, but to me he seemed like someone from a different generation.
‘Afterwards, I felt funny about it. I knew what had happened wasn’t right…
She added: ‘My dad turned it into a shtick with his friends.
‘They made up elaborate schemes to blackmail the guy and they rehearsed how they’d call him up and put the s**ts up him.
‘I just know that my dad turned me having sex with this guy I hardly knew into a joke between him and his mates. That didn’t make me feel good.’
Lily Allen with her father Keith. She claims her father poked fun at the sexual encounter she had when she was 14-years-old
The sexual encounter with the celebrity was not Lily’s first, who said she lost her virginity to a 20-year-old ‘guy called Fernando’ while on holiday in Brazil.
Last night, she was beaten to the 2018 Mercury Music Prize by indie rockers Wolf Alice.
She was spotted sobbing after being snubbed, and tweeted: ‘Someone call 999 I’ve been robbed’.
However, Lily later reached out to congratulate the band on their achievement as she wrote: ‘ I adore @wolfalice tho, and they are very deserved winners.’
Injecting a hint of her trademark humour, she continued: ‘Next time……… imma win that b***h.