Last weekend should have been one of triumph for embattled X Factor contestant Katie Waissel, as she managed to avoid being in the bottom two.
But the 24-year-old was instead embroiled in a devastating family feud as she learned that her grandmother was a £250-an-hour prostitute.
Speaking out for the first time, 81-year-old Sheila Vogel-Coupe has told how her granddaughter called her 'screaming' moments after performing the Beatles classic Help! on Saturday night's show.
Calling Katie's reaction 'vicious and vile,' Mrs Vogel-Coupe recalls: 'She screamed and shouted at me, saying "What are you doing to Mummy, what are you doing to the family?"
'She thinks I heaped shame on them. But I told her, "I'm doing what I enjoy - just leave me to do what I want to do."
'I'm proud to be a prostitute. I love what I do. I love sex,' she adds, and extended an invitation to X Factor supremo Cowell: 'Simon's welcome any time.'
Sheila, who goes by the name Grand Dame Cecilia Bird on the website for escort agency Mature Courtesans, told the Sun that she has bedded men as young as 23.
'Some of them have a fetish and want to call me mummy, auntie or grandma. I think it is a bit weird.
'It seems to be the 'in' thing. All the younger men want older women and I'm the oldest one at my agency, possibly the oldest in the country.
'I asked one, "What do you want with an old lady like me?" He said, "Because you're experienced, intelligent. Give me some intelligent conversation."'
Katie's family have been left devastated by the revelation and have disowned her, Sheila says.
The X Factor finalist's sister Natalie Davis said in a statement this week: 'We were completely shocked and devastated to hear the news that my grandmother has been conducting immoral activities, including prostitution and pornography.
'We, as a family, disassociate ourselves wholly from these activities and from any future stories that arise from them.'
Sheila, from North London, adds that Katie's mother Diana, her daughter, is furious with her actions.
'Diana called me a f***ing wh*** and her husband called me a wrinkly saggy old lady.
'The family are very embarrassed about it and Diana is making a big thing out of it to try to get Katie publicity and sympathy.'
But twice-married Mrs Vogel-Coupe, who has also appeared in a porn film, is defiant.
'I work as a prostitute because I love it,' she declares. 'It gives me great satisfaction and keeps me young.
'I could go on for years yet. Why should I stop?
'I think of myself as a refined lady giving a very special service men are not going to get anywhere else.
'I've had a few celebrity clients but I would never say who they were. They worked in the music industry and TV and things.
'I like to make men happy and content. I have no inhibitions. I love people. I'm an outgoing personality who lives in the 21st century.'
Katie enjoyed a turn in fortune last weekend when she managed to stay out of the bottom two.
The controversial contestant feared she would end up in the sing-off for the fourth time but was shocked when her name was read out first to go through to this week's live show.
The former receptionist underwent a drastic makeover last week, chopping off her platinum blonde hair into a brunette gamine crop.