Countdown's Rachel Riley has announced that she's having a baby with Strictly Come Dancing dancer Pasha Kovalev.

Riley broke the news on Instagram using a picture of herself cradling a baby bump on the set of the Channel 4 show, with the letters on the Countdown board spelling out "R TINY MATE".

She wrote: "Pash and I have a conundrum for you... you have till December to work it out!

"We're over the moon excited."

Maths whizz Riley, 33, and Russian dancer Kovalev, 39, have been together since 2014 after they were partnered in the 2013 season of Strictly Come Dancing.

Riley started dating Kovalev after splitting from her husband and fellow Oxford University student Jamie Gilbert in 2013.

Earlier this year Kovalev announced he was leaving Strictly Come Dancing after eight years on the show.