The 32-year-old blonde bombshell regularly titillates fans with her glamorous looks and leggy appearances on both Countdown and it’s comedy spin-off show, but last night’s instalment saw the host up the ante by asking her how she switched off her brain at the end of the day.
“Like most people, I get into bed…” Rachel Riley began.
“Woah, woah, slower,” Jimmy, 45, interjected, sparking giggles from the audience.
“Go online, look for something fun,” the maths whizz continued, a glint in her eye as the host’s face light up with a mischievous expression.
“When you’ve found something hard enough, just have a go at that for as long as I feel like,” she explained, while Jimmy gesticulated wildly, appearing delighted with the direction the conversation was taking.
“And then when I’m finished I just roll over and go to sleep.
“Number puzzles online, Jimmy,” she clarified, bursting the comedian’s bubble as she revealed she wasn’t talking about the same naughty behaviour her co-star might have been imagining.
Rachel also set pulses racing among 8 Out of 10 Cats Does Countdown viewers as she flashed her slender pins in a stylish minidress.
The bold orange number featured an A-line skirt with a pleat down the front and glittering embellishments.
Showing off her toned arms in the sleeveless frock, the former Strictly Come Dancing star ensured her svelte figure was the centre of attention as she performed her letters and numbers duties at the Countdown board.
Her famous golden locks were styled into a half-up ‘do of sleek curls and she opted for sultry smokey eye make-up to ramp up the sex appeal.
Fans took to Twitter to compliment the pin-up, with one gushing: “I swear @RachelRileyRR gets more and more stunning every week.”
“@RachelRileyRR is one hell of a sort,” another praised. “Absolute class.”
Later in the show, while the celebrity contestants challenged their brains as the Countdown clock ticked down, Jimmy filled the time by bringing out children dressed up like miniature versions of the stars.
Rachel’s “clone” wore the same dress and bore a striking resemblance to the presenter.
The studio audience let out an “aww” when she came out, and Rachel quickly helped the youngster up onto her stool.
Seeming smitten, she admitted: “I love her!” as she knelt down by the chair on a level with her counterpart.
The girl, meanwhile, kept things professional, staying quiet as the TV star and the audience coo-ed.
As well as Rachel, captains Sean Lock and Alan Carr, Jimmy and also lexicographer Susie Dent all had their own little “clones”, dressed identically to them for comic effect.
8 Out of 10 Cats Does Countdown continues next Friday at 9pm on Channel 4.