By Ellie May Donohoe For Mailonline
Published: 15:12 GMT, 3 March 2020 | Updated: 15:23 GMT, 3 March 2020
She is always the picture of professionalism.
Yet Rachel Riley was unable to hold in her giggles during Monday's episode of Countdown as a cheeky phrase came up on the board.
The mathematician, 34, was left blushing when guest star Rory Bremner spelled out 'screwing' in the pre-recorded episode, that was taped when Rachel was still pregnant.
Cheeky! Rachel Riley, 34, tried to hold in her giggles when guest star Rory Bremner spelled out 'screwing' on Monday night's Countdown
In the clip, which was filmed before Rachel welcomed daughter, Maven, she was seen spelling out the contestants suggested words of 'creasing' and 'swearing'.
Yet Rory then chimed in from Dictionary Corner with his suggestion, musing: 'You talked about DIY at the beginning, screwing is also there.'
The camera then panned to Rachel who looked highly bemused after she spelled out the word.
Funny: The pre recorded episode showed a pregnant Rachel before the birth of her baby, Maven, present while donning a floral blue dress