Holly Willoughby MORTIFIED as bikini-clad mum makes TV ‘appearance’: ‘Do that back up!’

Holly Willoughby was a long way from the comfort of the This Morning studio when she couldn’t believe her eyes as Celebrity Juice star Keith Lemon stripped off.

The presenter demanded the 45-year-old’s zip up his jacket before letting the audience and viewers at home in on why she had an issue with his attire.

The 37-year-old’s mum could be seen emblazoned across the comedian’s T-shirt and she was wearing very little.

The blonde beauty’s mother could easily have been mistaken for a Bond Girl, clad in a skimpy white bikini while wearing her dark tresses down in the throwback image.

Holly was left red-faced and hiding her head in her hands after his cheeky top was exposed.

Opening the show, Keith had introduced the beauty before she was quick to ask: “Are you alright?” as he pretended to be feeling too hot.

“I’m really warm… very warm,” he told her, as he peeled off layers in between her desk and her fellow team captain Fearne Cotton’s.

“Oh my god!” she exclaimed on seeing her mum’s picture on his garment, as he tried to continue on: “Holly, who’s on your team?”

“Please do that back up right now,” she told him. “That’s my mum. Seriously there is a line, and that is leaping over it.”

Thankfully all appeared to be taken in good humour, and was the latest of a long list of times he has attempted to wind up the mother-of-three.

Keith even went as far as to rub his hands over the photograph, as she shouted: “Stop that! Stop, stop, stop…”

Wearing her tresses down in a loose wave, Holly showed off her toned pins in a super shiny, metallic skirt for the episode.

She teamed the thigh-skimming piece with white boots and a grey T-shirt, which had “milk and sugar” written across the front.

The star had previously shared her look on Instagram, writing: “Tonight at @celebjuiceofficial I’m wearing a [unicorn]… skirt and t-shirt @harveynichols boots @aldo_shoes #hwstyle.”

She was soon inundated with with compliments from her 4.1 million followers, with one person simply replying: “Wow.”

Two others continued: “So pretty!” and: “Love the skirt #hollywilloughby.”

The latest instalment saw the regulars joined by John Barrowman, Lucy Fallon, Diversity’s Jordan Banjo and Suggs.

The dancer and Coronation Street star, who plays Bethany Platt in the drama, went head-to-head in an elastic band challenge.

Meanwhile, it comes just days after Holly Willoughby dropped a baby bombshell, saying she had thought about expanding her brood with husband Dan Baldwin.

Celebrity Juice airs tonight at 10pm on ITV2.