The presenter teased a glimpse of her cleavage as she opted for a seriously sexy, low-cut frock as she resumed her duties in front of the letters and numbers board.
Her ample assets could just be seen in the racy style, which featured a plunging neckline and bare shoulders.
Rachel’s pretty summer dress featured spaghetti straps and frilled detailing along the neckline as well as a purple floral pattern.
It wasn’t just her décolletage that was left exposed, the maths whiz also flaunted her enviably toned pins.
Her thigh-grazing frock allowed her endless pins to take centre stage as she selected consonants and vowels for today’s contestants.
The strappy style was certainly suitable for the recent warm weather and fans at home seemed thrilled to see Rachel Riley flashing the flesh.
Viewers took to Twitter to comment on her summery attire with one sharing: “Oh Rachel Riley. I would drink her bathwater. What a beauty. Was meant to go get running trainers 45 mins ago, but kinda got distracted.”
Another added: “Only reason I watch countdown is for @RachelRileyRR. The woman has got the brains as well as looks #whatawoman.”
“A delightful new look today. Rachel looking tremendous! #Countdown #RachelRiley,” a third tweeted.
Countdown airs weekdays on Channel 4 at 2.10pm.
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