Billionaire James Stunt holds bag of white powder and has suspicious marks on his clothes as he exits exclusive Mayfair nightclub at 3am

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Billionaire entrepreneur James Stunt was in high spirits as he barreled out of a nightclub at the weekend surrounded by friends and minders.

The gold bullion dealer - the ex-husband of Formula One heiress Petra Ecclestone - had suspicious white marks on his trousers and was holding a bag of white powder as he exited the members-only Tramp nightclub in London's Piccadilly.

He had been partying into the small hours with friends and joked with photographers as he left the nightclub shortly before 3am on Sunday morning - followed by ex-Hollyoaks actress Samantha Rowley.

A bystander said: 'He seemed very happy and was chatting to everyone. He joked that his fiance was there too. I think he was being sarcastic.'

Billionaire gold bullion dealer James Stunt was spotted with suspicious white marks on his trousers outside a club on Sunday

The 36-year-old appeared to be clutching a bag of white powder as he jumped into his car outside the nightspot

He leaned out of the window of one of his famous fleet of cars as he was driven away from Tramp club in Piccadilly

Former Hollyoaks actress Samantha Rowley - who was reportedly in a relationship with Stunt - was also seen at the venue

Ms Rowley jumped into the front passenger seat of the chauffeur-driven car and Stunt gestured to photographers as they left 

The 36-year-old's public appearance comes after he categorically denied claims he rubbed cocaine into his gums during his high-profile court battle with ex-wife Petra, the daughter of F1 tycoon Bernie Ecclestone.

Earlier this month, an associate of Mr Stunt told The Mail on Sunday he had seen the socialite 'dabbing something from a cigarette packet and rubbing it on his gums' during the court battle.

The associate added: 'I had seen him do the same thing with cocaine.'

One of Mr Stunt's former bodyguards also claimed he had provided a fake urine sample to help the businessman pass drug tests he took as part of the court proceedings.

Mr Stunt branded the claims 'monstrous and completely untrue' and said that while he had 'taken cocaine on occasion' he had never done so on a huge scale.

He added: 'These allegations are from disgruntled employees and I'm astonished they're being taken seriously.'

The socialite appeared to have a bag of white powder in his hand as he posed for photographs with one of his friends

Stunt has faced accusations of drug-taking in recent weeks, but has insisted they are 'monstrous and completely untrue'

Mr Stunt was aided by a friend as he left the club in London's Jermyn Street and walked towards a waiting car

The 36-year-old talked excitedly to a friend as he was driven off into the night in the early hours of Sunday morning

Mr Stunt has rumoured to have been in a number of relationships since his court battle with Petra earlier this year.

It was claimed that glamorous brunette Kristina Wurtemberg had staying at the billionaire's Belgravia townhouse in central London last month.

The 26-year-old, from Halifax in Nova Scotia, was last month photographed in Stunt's Lamborghini as they headed to dinner at one of the capital's top restaurants.

Following his divorce settlement with the youngest daughter of F1 boss Bernie Ecclestone, Stunt reportedly enjoyed a brief relationship with actress Ms Rowley.

But his appearance at the same nightclub as her on Saturday will reignite rumours he is seeing her again. 

Bystanders said he was in good spirits as he walked out of the club wear black shoes, trousers and jacket and a blue sweater

Stunt has been rumoured to be in a number of relationships since his court battle with ex-wife Petra Stunt earlier this year