Duchess Kate joins list of super-fit moms Jennifer Lopez, Heidi Klum...

Kate Middleton back in her SKINNY JEANS — 6 weeks after baby!

Duchess of Cambridge, 33, makes losing weight after having a baby look so easy.

Catherine Duchess of Cambridge attends the Gigaset Charity Polo Match with Prince George of Cambridge at Beaufort Polo Club. (Getty Images)

The mother of two stepped out looking cool and casual on June 14 as she played with Prince George at the Festival of Polo match at Beaufort Polo Club in Tetbury, England, while her husband, Prince William, played in the game.

Well, nobody was bothered about the outcome of the Polo match but millions around the world had gawped at how slim Kate looked and marvelled at how quickly she had lost the baby weight since giving birth to Princess Charlotte in early May.

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Where did all the pregnancy weight vanish?

The small weight she gained while pregnant has just melted off, you could hardly tell she had just given birth.

People who know Duchess insist Kate Middleton sticks to a strict diet and gets plenty of exercise by taking walks and playing with Prince George.

Prince William, Duke of Cambridge talks to his son Prince George of Cambridge with Catherine, Duchess of Cambridge at the Gigaset Charity Polo Match at Beaufort Polo Club. (Getty Images)

We remember how she flashed those abs three months after Prince George's birth. Middleton flashed her flat stomach on the volleyball court during a SportsAid Athlete Workshop at the Copper Box Arena in London's Queen Elizabeth Olympic Park.

Casual chic in a Ralph Lauren striped top, jeggings and in wedges, the Royal looked silm and super-fit.

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On this occasion Kate actually relied on her trusty Topshop maternity jeans — and since she was chasing after Prince George we can't say we blame her for wanting to be comfortable.

But maternity jeans or not Kate has lost any extra pounds astonishingly fast and she is far from being alone.

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She joins the ranks of stars including Jennifer Lopez, Kate Hudson, Jessica Alba and Tamara Ecclestone who all managed to fit into their pre-baby clothes in under a year.

Jennifer Lopez gained 50lbs when she was pregnant with twins Max and Emme.

After having the twins in February, the weight disappeared almost instantly.

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Kate Hudson gave birth to her son Bingham in July and by November there was no hint of a baby belly.

But the actress was very open about how difficult it was for her to shift the pounds - she worked out for a staggering six hours a day.

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Jessica Alba gained 35lbs when she was pregnant with her daughter Honor, but after giving birth she took help from personal trainer Ramona Braganzato to shifting the extra weight.

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Tamara Ecclestone's post-baby weight loss shocked people around the world.

She stayed away from hard drinks, caffeine and most non-organic foods but mainly put the weight loss down to good genes.

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In 2005, Heidi Klum wasted no time and she famously walked down the Victoria's Secret catwalk in underwear just two months after giving birth.

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Victoria's Secret model Alessandra Ambrosio managed to lose the 45lbs she gained during her pregnancy in 2008 in just three months. She then walked down the catwalk for an undergarment show.

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