Braless Lizzie Cundy slips into miniscule £15 charity shop dress after she was asked to leave Ascot for flouting their strict dress code

showed off her incredible figure in a risqué - yet thrifty - mini dress during a charity book launch on Wednesday evening. 

The former WAG rubbed shoulders with fellow stars at Mayfair's swanky MR PORTER bar and restaurant to Dr Nighat Arif's new book The Complete Guide to Family Health.

While showing off her phenomenal frame and eye-popping cleavage, Lizzie, 58, revealed the barely-there slip dress, complete with cowl-neck and thigh-skimming hem, was a £15 bargain from her local charity shop. 

Despite the nifty price tag, Lizzie still looked to be abiding by the high fashion dress code of the evening, where she was joined by fellow host Saira Khan, the author Dr Nighat and fellow medical professional Dr . 

Her outing comes after Lizzie furiously demanded that changes its rules after she was turned away last month for flouting the strict dress code.

She was accused of disobeying the rules by wearing a daringly see-through netted ensemble with a racy back slit on day one of Royal Ascot.

Lizzie did not let Ascot chiefs stop her sexy style, as she continued to showcase her trademark raunchy looks during the bash. 

Celebrating Dr Nighat, the stunner was joined by Loose Women star Saira who went for similar sparkles in a sequinned dress yet opted for a ankle-skimming length.  

Dr Nighat was pretty in pink and orange, with her floral gown ensuring all eyes were on her as she signed her new book. 

Dr Hilary far defied his 73 years as he put on a youthful display in a suave grey blazer and crisp white shirt while posing with the ladies of the hour.     

Last month, Lizzie hit back reagarding Ascot, as she said her outfit was actually lined with a beige slip and simply gave the illusion of being more revealing than it was. 

And following the event, Lizzie broke her silence during an appearance on , and while she apologised, she also suggested that it might be time Royal Ascot adapted to the times and updated its rules. 

Defending the dress she began: 'Listen, I'm going to say a galloping jockey could see that that dress wasn't see-through. 

'The dress had like a beigey underlay underneath, and I'll be honest Kate, I don't think you've seen me with so many clothes on.' 

Agreeing, host Kate Garraway said: 'Well, it is the most conservative I've ever seen you dress, Lizzie. 

'When I heard that you had run into this spot of bother, I thought, "My goodness, I've got to see what she's wearing," and I was like, "oh that's fine. What are we talking about?" But it's not fine for the Royal enclosure.'

Lizzie continued: 'I didn't follow the rules, but well, I thought actually I did follow the rules, and I got a bit of a slap on the wrist, and I have said sorry, which I am sorry, but I do believe particularly the races, it is all about the fashion. 

'Especially the women, they go and get their dresses, their hats. It's supposed to be fun, and you know that's what I am.' 

Demanding the event changes its rules she said: 'I honestly think we're taking this too seriously. Look at what's going on in the world. I mean, I abide by the rules but in fashion I like to reflect my personality.

'I'm sorry, fashions change, we need to have the Ascot rules reviewed yearly as fashion looks change through the seasons. We need it updated.'

Meanwhile etiquette expert Laura Windsor said: 'There are specific dress codes and it's all splattered all over the internet on what to wear and there are certain guidelines that you have to follow and you can still be fashionable. 

'I'm a personal stylist as well, so I understand Lizzie wanting to show her personality through her clothes, but unfortunately it did look a little bit see-through, probably because of that skin colored camisole underneath.'