The trio – who were also joined by Lauren’s eldest son Adam, 15 – appeared in high spirits when they left The Arts Club, with Simon, 61, opting for his staple shirt and trousers look, while Sinitta, 52, slipped into a thigh-skimming dress.
Lauren, 43, cut a typically stylish figure in white jeans teamed with an off-the-shoulder blouse and kept the sunshine at bay behind a pair of sunglasses.
Friendly exes: Simon Cowell, 61, and his partner Lauren Silverman, 43, were joined by the music mogul’s ex Sinitta, 52, for lunch in London on Sunday
The mother-of-two wore her glossy brunette hair loose.
Singer Sinitta had her beloved pet dog tucked under her right arm as she left the venue alongside Simon and his girlfriend and toted her belongings in a chic leather handbag.
She showed off her immaculate pedicure in a pair of open-toe sandals.
Simon and Sinitta had an on-off romance for 20 years after first meeting in the 1980s.
Stylish: Lauren, 43, cut a typically stylish figure in white jeans teamed with an off-the-shoulder blouse and kept the sunshine at bay behind a pair of sunglasses
Lunch with the adults: Lauren’s 15-year-old son Adam – who she has from a previous relationship – also joined the group for lunch
Last year, Sinitta suggested their on-off romance was ‘never really over’ until he had son Eric with girlfriend Lauren Silverman in 2014.
When asked when her and Simon had ‘finally called it quits’ on their love affair, the singer, 56, told New! Magazine: ”There was always an element of ‘well, it’s never really over.”’
‘But when Eric was born that was it. I would never come between his family.’
Pins on show: Sinitta slipped into a thigh-skimming dress and carried her beloved pet dog under her right arm
Discussing the ructions caused between her and Simon, she added: ‘[Lauren] and I were best friends. I’m really happy for them, but it was hard and caused a fallout.’
Sinitta said she had a long-held belief that once Simon had stopped dating other women, they would eventually end up together, adding that she would have married him and ‘never’ fell out of love with him.
The So Macho songstress also added that she ‘adored’ Eric, now seven.
Chic: Mother-of-two Lauren kept her belongings safe in a chic green handbag and wore a luxury gold watch on her left wrist
It comes after Simon reportedly pulled out of jetting to Israel to take part in their version of The X Factor due to the violence in Gaza.
According to Jewish News, the music industry titan pulled out of sitting on the panel for The X Factor Israel after having ‘legitimate concerns’ about travelling there.
The current eruption of violence in the Gaza Strip began last month in Jerusalem, where heavy-handed Israeli police tactics during Ramadan and the threatened eviction of dozens of Palestinian families by Jewish settlers ignited protests and clashes with police.
Pedicure: Sinitta toted her belongings in a chic leather handbag and showed off her immaculate pedicure in open-toe sandals
The X Factor’s production company, Reshet, said that Simon had pulled out ‘for his own reasons’ and that he was ‘bitterly disappointed’ by the decision.
A source added: ‘Simon won’t be going to Israel after all. I know it has already been announced that he was one of the judges, but for a number of reasons he just can’t be there in Israel to film the show now.
‘Of course he is bitterly disappointed – but it was a decision he had to take.’
A representative for Simon declined to comment when contacted by MailOnline.
The show had already been delayed due to the pandemic, originally intended to begin production at the end of 2020.
Simon was set to be a judge, alongside 2018 Eurovision winner Netta Barzilai, and singers Aviv Geffen, Margalit Tzanani, Miri Mesika and Ran Danker.
‘I can barely wait to see what the Israelis have to offer,’ was Simon’s comment when he was first slated to appear on the show.
Yet it seems he won’t be taking part at all as the the violent clashes between Arabs and Jews in Israel have resulted in terrible scenes not witnessed in more than two decades.
Candid: Last year Sinitta suggested her on-off romance with Simon was ‘never really over’ until he had son Eric with girlfriend Lauren in 2014 (pictured July 2019)
Family: Simon and Lauren welcomed Eric in February 2014 (pictured August 2018)
A focal point of clashes was Jerusalem’s Al-Aqsa Mosque, built on a hilltop compound that is revered by Jews and Muslims.
Israel regards Jerusalem in its entirety as its capital, while the Palestinians want east Jerusalem to be the capital of their future state.
Simon reportedly has his hands full with other projects meanwhile, as he is said to be working on a new talent show with plans to air it on one of ITV’s ‘rival channels’.
The mogul is currently ‘weighing up his options’ and even considering taking his new show to a streaming platform such as Netflix instead of airing it on a terrestrial channel.
The Sun reports that ‘Simon has told friends he is sick of competitors trying to out-do the brand, so decided he would do it himself’.
Happier times: They had an on-off romance for 20 years after first meeting in the 1980s (pictured 1985)
A source told the paper: ‘Simon is constantly thinking creatively of new ideas and shows, innovating and evolving all the time. He’s vowed that his next show will be bigger and better than BGT.’
They added: ‘He’s weighing up his options. Simon has a big vision and the likes of Netflix have hundreds of millions in their coffers to help make it a reality.’
Simon recently returned to the America’s Got Talent judging panel after breaking his back in a horrific bike accident.
The father-of-one had to undergo a six-hour surgery to have a rod inserted after the crash.
He was at least doing well enough after the accident to share a short message on his social media accounts.
‘Some good advice… If you buy an electric trail bike, read the manual before you ride it for the first time,’ he wrote ominously.
‘I have broken part of my back. Thank you to everyone for your kind messages. And a massive thank you to all the nurses and doctors. Some of the nicest people I have ever me.’
Taking a stand: It comes after Simon reportedly pulled out of jetting to Israel to take part in their version of The X Factor due to the violence in Gaza