Rachel Riley exuded old Hollywood glamour as she transformed into Marilyn Monroe for a special Halloween episode on Countdown.

The TV presenter, 38, stunned in a beautiful pink silk sleeveless dress with dramatic silver detailing.

She paired the gown, which featured a large bow on the back, with a pair of matching dress gloves which ran up her arms.

To complete her classy ensemble, she accessorised with a myriad of silver jewellery including a large diamond necklace.

Adding inches to her frame, she slipped into a pair of classic black slingback heels.

She also styled her luminous blonde locks into a loose wave bob with an elegant side parting.

Channel Four transformed their studio for the special holiday as contestants sat in front of ghost-covered walls.

The famous clock was surrounded in a spooky green LED lighting and was lit up in a burnt orange colour.

Meanwhile the word board was also decorated for the occasion, featuring a frame of cobwebs and pumpkins.

Neil Delamere transformed into Frankenstein's monster as he appeared in the dictionary corner covered in green paint and a headpiece.

To complete the look, he wore an oversized blazer, which featured creative stitching around the shoulder.

Next to him, Susie Dent looked incredible as she dressed up in a gothic Victorian dress.

To add some extra glitz to her look as she painted two black sparkly cobweb designs to her cheeks.

Show host Colin Murray also got in the spooky spirit as he dressed as a dead butler.

For his costume, he paired a black Halloween-themed blazer with a black top hat and feather accessories.

Also joining in on the fun, one contestant wore a quirky black cardigan which featured some white skull patterns.

While the other contestant was less on the nose with his outfit choice as he opted for a blood-red shirt and black tie.