Her beau Simon Cowell was forced to abruptly cancel his 60th birthday celebrations earlier this week.
And Lauren Silverman, 42, put on a sensational style display as she headed out in London on Thursday.
The beauty wowed in a tight navy turtleneck navy dress which she teamed with a pair of knee-high black boots.
There she is! Lauren Silverman, 42, put on a sensational style display as she headed out in London on Thursday
Lauren put emphasis on her trim waist with a thin black belt and toted her essentials in a chic handbag.
She sported a sensational blowdry and shielded her striking features with a pair of chic shades.
Her sighting comes after Simon cancelled his birthday celebrations just days before he was set to host an exclusive party at a west London restaurant.
The music mogul, who turned 60 on the 7 October, had celebrity guests flying from all over the world to celebrate his milestone at Chelsea restaurant, La Famiglia, on Wednesday night.
Sartorially savvy: The beauty wowed in a tight navy turtleneck navy dress which she teamed with a pair of knee-high black boots
Simon and his partner, Lauren sent out cancellations just days before the birthday extravaganza, citing ‘scheduling conflicts’ as the reason, leaving his showbiz friends’ plans in turmoil.
Instead of celebrating his big day, the television personality would rather focus on the current celebrity series of The X Factor, which has suffered disappointing ratings thus far.
A spokesperson for Simon told MailOnline: ‘The decision was made to postpone the dinner yesterday morning.
Cancelled: Her sighting comes after Simon cancelled his birthday celebrations just days before he was set to host an exclusive party at a west London restaurant
‘Simon’s priority is his incredibly busy work schedule over the next month and this, of course, includes the current series of The X Factor as well as other TV and music projects.’
Simon, who celebrated his actual birthday with a small dinner in LA earlier this month, is said to be rearranging his party for early December, when The X Factor has wrapped.
A source told MailOnline: ‘Simon’s focus is solely on work for now. It’s no secret Simon is a workaholic and he always strives to improve everything he’s involved in.
Event: The music mogul, who turned 60 on October 7, had celebrity guests flying from all over the world to celebrate his milestone at Chelsea restaurant, La Famiglia, on Wednesday night
Location: Chelsea restaurant, La Famiglia, where Simon’s 60th party was due to take place
‘He also doesn’t want people hungover on Thursday and would rather the focus is purely on work – and of course the upcoming shows – rather than celebrating his 60th.
‘His actual birthday was earlier this month anyway – and he had a small dinner in LA. So he’s just decided this bigger dinner can wait until December when work starts to calm down.’
The last-minute cancellation is said to have thrown the plans of many of the mogul’s A-list friends into chaos, with numerous guests flying to London for the event.
A second source told MailOnline: ‘Simon had planned a suitably extravagant event for his 60th and had guests flying in from all over the world to celebrate.
‘Cancelling just days before has really thrown people’s plans up into the air.’
Cancelled: Plans: Simon and his partner, Lauren sent out cancellations just days before the birthday extravaganza, citing ‘scheduling conflicts’ (pictured in July)
Simon and Lauren sent guests a cancellation on Tuesday, just one day before the celebration, it read: ‘Dear all, I am so sorry but this dinner is cancelled/postponed. (sic)
‘Scheduling conflicts unfortunately are prohibiting us from having this dinner at this time. (sic)
‘We will keep you posted as to when it will be rescheduled for. Thank you for understanding, Lauren and Simon.’ (sic)
Simon’s 60th birthday bash was due to take place at the intimate Chelsea restaurant, La Famiglia, at 6.30pm on Wednesday 30 October.
Rearranging: Simon, who celebrated his actual birthday with a small dinner in LA earlier this month, is said to be rearranging his party for December (the original invite is pictured)
La Famiglia has hosted stars from around the world, with the likes of Princess Margaret, Brigitte Bardot and Michael Caine dining at the Chelsea eatery over the years.
The Italian restaurant, based in Chelsea, has several Tuscan delicacies on the menu, including angel hair egg pasta with truffle oil and Parmesan, and thinly sliced veal with tuna mayonnaise.
La Famiglia states on its website that lunch with a starter, main and wine for two is priced at roughly £80.
Simon celebrated his 60th with a small dinner with partner Lauren, son Eric, five, and some of his closest friends at celebrity hotspot Nobu in Malibu on his official birthday on October 7.
Hot spot: La Famiglia has hosted stars from around the world, with the likes of Princess Margaret, Brigitte Bardot and Michael Caine dining at the Chelsea eatery over the years
The music mogul partied hard during the long dinner, emerging with a huge smile on his face before he accepted a bottle of wine from photographers for the ride home.
At the event, Simon was also joined by partner Lauren’s son Adam, his Britain’s Got Talent co-star Alesha Dixon, 41, his ex and close friend Terri Seymour, 47, and America’s Got Talent co-star Howie Mandel, 63.
Simon’s cancellation comes after he made an appearance with partner Lauren at Monday’s Pride of Britain Awards.
The X Factor judge continued to display his considerably slimmer frame after losing 20lbs thanks to adopting a strict vegan lifestyle earlier this year.
The Britain’s Got Talent judge recently admitted during an appearance on The Ellen DeGeneres Show that he drastically changed his diet so he could keep up with son Eric.
Pals: Simon celebrated his 60th with a small dinner with partner Lauren, son Eric, five, and ex and close friend Terri Seymour, 47, at Nobu in Malibu on his official birthday on October 7
He said: ‘I went to see this doctor in London. We did some tests. And then a month later he said, “You have the worst diet I’ve ever met from any patient.”
‘So I went, “Okay, out of the smoking, the drinking, and diet, what do I have to drop?” And he said, “The diet.” So I said, “I’m in!”
‘It was easier than I thought, and part of the reason I did it was because of Eric. I realised if I didn’t sort myself out physically, I wouldn’t be able to catch up with him.
‘Because the minute he gets up to the minute he goes to sleep … their energy, you forget, at five-years-old, is phenomenal.’
Simon previously said he’d named his diet the Eric Cowell diet after his son, because the youngster loves to munch on raw vegetables.
He said: ‘It’s like the Eric diet because he actually, apart from ice cream, he actually likes water. I mean, who likes water? And his raw vegetables. So I’m on like, the Eric Cowell diet.’
Cosy: Simon and Lauren attended the Pride Of Britain Awards at London’s Grosvenor House Hotel on Monday night, just as the party was cancelled (pictured)