She is, of course, known for her shapely posterior.

But there’s no denying that Kim Kardashian looked particularly bootylicious when she hit the beach on Monday – in a barely-there bikini.

Showcasing her curves in a modest two-piece, the reality TV star certainly made a splash while holidaying in Tulum, Mexico, with sister Kourtney and a group of friends, this week.

Stepping out in a red, white and green number, the mother-of-two, 36, evidently wasn’t feeling shy.

In fact, she was almost upstaged by her world-famous asset – especially as the skimpy material barely covered her modesty.

Moreover, the bold sighting left some fans wondering whether the star had deliberately – or perhaps surgically – gained weight on her upper thighs, or whether her choice of clothing simply gave that illusion.

abPreviously, Kim has denied any such procedures – even having her buttocks X-rayed on an episode of Keeping Up With The Kardashians.

We asked E4 Body Fixers star and celebrity favourite, Dr Esho from The Esho Clinic, for an insiders’ opnion.

He said: “Kim Kardashian has always remained secretive about her cosmetic surgery, whilst her body has gone through a number of notable changes throughout her career.

“From these photos it seems likely she may have undergone a procedure called the Brazilian Butt Lift, which is a popular treatment in my clinic.

“This is where fat is grafted and removed from the the thighs and stomach using liposuction. Then, the fat is then injected and sculpted into the buttocks giving a much more full, round and lifted look.”

However, he insists, patients must be careful to avoid an unnatural look.

ac“People must take care with this procedure as it’s important to keep and ideal ratio between thighs, the waist and the buttocks,” he said. “Too much can give a very unnatural finish…”

The Mirror have contacted a representative of Kim Kardashian for comment, but are yet to receive a reply.

Either way, by squeezing herself into the sexy two-piece, her silhouette was shamelessly shapely.

Not that Kourtney was any more demure, of course. She deliberately flaunted serious underboob in a bright red, string bikini which left little to the imagination.

Fortunately, she appeared to use toupée tape for added assistance in avoiding any possible wardrobe malfunctions, which was a wise move.

At one point, she almost suffered a nip slip while scraping her hair back – but managed to avoid it.