Rachel Riley looks incredible as she shrinks her waist with an ‘illusion’ dress on Countdown

RACHEL Riley dazzled in yet another eye-catching costume on Countdown.

The stunning brainbox shrunk her waist in an 'illusion' style dress on the Channel Four show.

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The tight frock cleverly featured cream wavy lines making her waist appear even slimmer and accentuating her curves.

The 31-year-old wore her blonde hair loose over her shoulders while she teamed her frock with cream heels.

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Rachel's outfits regularly cause a stir on the daytime hit programme.

Earlier this week she was left red-faced after her tight blue dress burst open at the back.

The blonde maths whizz was placing letters on the board when the frock split, sending viewers wild on Twitter.

And last month, viewers flooded YouTube with clips of her best dressed moments.

One compilation is titled “Rachel Riley – Top 5 Shortest Dresses Ever” and another shows her attempting to play mini-golf on set wearing a very skimpy frock.

And a Countdown clip from 2015 showed Rachel bra-less in a tight, pink dress went viral.

The video has since been circulating online since it resurfaced and has scored around 285,000 hits on YouTube.

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Previously Rachel has been left embarrassed on the show by having to spell out a VERY awkward word.