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Oops ... punter lights up beside pregnant Kate at Cheltenham

SHE is possibly the most famous mum-to-be in the world, although Kim Kardashian might disagree.

Nonetheless, everyone knows Kate Middleton is pregnant with an heir to the throne.

And modern-day etiquette is you don't light up beside a pregnant woman.

But when one is at Cheltenham, perhaps all rules go out of the window.

A glowing Kate joined Prince William and an assortment of friends for the last day of Cheltenham – including one person nearby enjoying a cigarette in close proximity to pregnant Kate.

A five-months pregnant Kate (31) kept her growing bump under a blush-coloured Joseph coat, accessorised with a dark chocolate brown bow trimmed Betty Boop hat from Lock & Co, brown gloves, brown patterned tights and knee-high brown boots.

The royal couple were there to cheer on Monbeg Dude – the racehorse owned by rugby star Mike Tindall, who is married to William's cousin, Zara Phillips.

Zara previously revealed it was "probable" she called her husband an idiot after he bought the horse, which he knew nothing about, for £12,000 at a charity auction.

"He just started bidding, but he didn't know what he was bidding for," Zara said.

"He didn't know any of its form or anything, but luckily the horse has won."