Watch as Pippa Middleton is serenaded by a diner at a Kensington restaurant

This is the moment a man serenaded a ‘polite and charming’ Pippa Middleton at a Kensington restaurant.

The Princess of Wales’ sister, 39, was out for dinner at Cambio De Tercio in Kensington, London, with her husband James Matthews and two of their friends.

A fellow diner plucked up the courage to sing Frank Sinatra’s My Way to Pippa on his way to the bathroom. 

The performance took place on June 14, 2017, and the unearthed clip of the moment shows singer, Mark Lister, 66, breaking out into song while dressed in a blue ensemble.

Mark said the ‘alcohol helped’ and that he decided to sing for a laugh and as an ‘apology’ for not attending Pippa’s wedding in May 2017.

Father-of-two Mark, a business owner, from Windsor, Berkshire said: ‘Alcohol helped massively. She seemed to be enjoying it a lot – I enjoyed it a lot.

‘I went to the loo and I spotted her, so I said “sorry I couldn’t attend the wedding I will sing you a song instead” and she seemed to take well to it.

‘It was a lovely atmosphere, she said thank you, and she was very polite and very charming.

‘I absolutely love singing and it was a pleasure to do it for her. She looked fabulous – she seemed to be enjoying herself.’

It comes after Pippa’s third child with her husband, financier James Matthews, 47, was christened this week at their local village church in Berkshire, reported The Daily Mail’s Richard Eden.

He was told: ‘Prince William and Catherine both attended the service.’

Seven-month-old Rose is the sixth grandchild of Carole and Mike Middleton, who are also grandparents to Prince George, Princess Charlotte and Prince Louis. 

Pippa, James, Rose and their two other children Arthur, four, Grace, one, spent time earlier this month enjoying a sun-soaked holiday in St Barts, where the Matthews family owns the Eden Rock resort, one of the region’s most exclusive hotels. 

Stars including Elton John, Brad Pitt and Leonardo DiCaprio have stayed at the glamorous resort.

Pippa being serenaded at a Kensington restaurant, pictured

This is the moment a man serenaded a ‘polite and charming’ Pippa Middleton at a Kensington restaurant 

The Princess of Wales' sister, 39, was out for dinner at Cambio De Tercio in Kensington, London, with her husband James Matthews and two of their friends

The Princess of Wales’ sister, 39, was out for dinner at Cambio De Tercio in Kensington, London, with her husband James Matthews and two of their friends

James’s parents, David and Jane Matthews, moved to St Barts in September 1995 after purchasing Eden Rock from local adventurer Rémy de Haenen. 

During her holiday to St Barts, mother-of-three Pippa appeared fit and athletic as she soaked up the sun alongside youngsters Arthur, Grace and Rose. 

Pippa, like her older sister Kate, is known for her athletic frame and sporting prowess.

As well as taking part in sports like hockey and tennis while a student at Marlborough and Edinburgh University, she reportedly continues to work out daily.

And the 39-year-old has taken part in a number of sporting events, like the 2011 GE Blenheim Triathlon, where she competed a 5km race.

Other events Pippa has competed in include the gruelling 50-mile ÖTILLÖ swimming and running event in Stockholm, Sweden. 

A fellow diner plucked up the courage to sing Frank Sinatra's My Way to Pippa on his way to the bathroom

The performance took place on June 14, 2017, and the unearthed clip of the moment shows singer, Mark Lister, 66, breaking out into song while dressed in a blue ensemble

A fellow diner plucked up the courage to sing Frank Sinatra’s My Way to Pippa on his way to the bathroom 

Mark said the 'alcohol helped' and that he decided to sing for a laugh and as an 'apology' for not attending Pippa's wedding in May 2017

Mark said the ‘alcohol helped’ and that he decided to sing for a laugh and as an ‘apology’ for not attending Pippa’s wedding in May 2017

Despite the scale of the challenge, Pippa appeared in good spirits throughout, despite the freezing temperatures.

She was even seen waving to onlookers during the event, which took her 13 hours, four minutes and 24 seconds to complete.

An ambassador of the British Heart Foundation, Pippa has also cycled the 54 miles between London and Brighton on behalf of the charity.

Speaking previously about why fitness is so important to her, Pippa highlighted the mental and physical benefits.

She said: ‘Exercise is a massive part of my life and a very personal thing for me; it’s so important for both the mind and body.’

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