Hard work gets results: Pippa shows off her KILLER bikini bod

Running, swimming, cycling… the outdoors life has definitely paid off for Pippa Middleton.

Kate's sister was pictured on holiday on the Carribean island of St Barts this week with some friends and family, looking downright incredible in a tiny red bikini as she relaxed on the water. 

Standing on a pontoon with her mother Carole, brother James and rumoured ex James Matthews, there was no doubt 31-year-old Pippa was looking in the best shape of her life. 

Those abs!

Of course, Pippa's always had an enviable body – back in 2011 she almost stole the show from her big sister as she dressed all in white to act as maid of honour at the Royal Wedding, wearing a figure-hugging gown designed by Sarah Burton for Alexander McQueen.

The dress had a plunging neckline and the same button and lace trim details as Kate's own creation, also designed by Sarah Burton.

And while we have seen Pippa don a bikini before – like this white one for the family's annual holiday to Mustique a few years back, for example – she's looking more toned than ever thanks to the gruelling fitness regime she kicked off last year.

Back in June 2014 Pippa, her brother and a team of six others took on the Race for America, an eight day cycle for over 4,800 km across the US in aid of the Michael Matthews Foundation. Just weeks later, the same team headed to Istanbul to take on the Bosphorus Cross-Continental Race a 6.5km swim crossing two continents from Europe to Asia.

To round things off, just last month the Royal-in-law completed her first ever marathon… in temperatures of over 30C and at 1,600m above sea level in Kenya. "It was tough – tougher than anything I’d been faced with before and required every inch of my energy, stamina and stubbornness," Pippa told Hello! after finishing the 42km course.

While she definitely cuts no corners when it comes to her workouts, Pippa says she does allow herself the odd treat at mealtimes.

"I grew up with the belief that good health is about moderation in all things, so I'll be celebrating healthy living through exercise, a balanced diet, and a little of the naughty stuff sprinkled in — I'm talking chocolate, crisps, and the occasional glass of wine," she wrote in a column for Waitrose Weekend magazine last year.

Forget party planning… we reckon Pippa has a career in personal training ahead of her.

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