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HOLLY Willoughby has bagged one of the most coveted prime time presenting gigs going as she joins Declan Donnelly on I'm A Celeb.

And with all eyes on her for the next three weeks, the This Morning host wanted to make sure she looked her very best before heading Down Under.

 Holly has bagged a prime time presenting gig on I'm A Celeb with Declan Donnelly
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Holly has bagged a prime time presenting gig on I'm A Celeb with Declan DonnellyCredit: Rex Features

Mum-of-three Holly has slimmed down in recent years and, despite describing herself as a ";curvy girl", is a svelte size 12

She admits she still loves a slice of pizza and insists that all she wants to be is "healthy and happy".

But Holly does have a few secrets as to how she maintains her amazing figure.

So how DID she get her I'm A Celeb body?

 Holly in October 2015, before her transformation
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Holly in October 2015, before her transformationCredit: Rex Features
 Holly has slimmed down in recent years but still describes herself as "a curvy girl"
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Holly has slimmed down in recent years but still describes herself as "a curvy girl"Credit: WENN

Her healthy(ish) diet

A source told Fabulous Online that Holly sticks to a relatively low-carb diet, mainly eating chicken and fish, served with loads of vegetables.

But that doesn't mean Holly doesn't allow herself the odd treat.

She's a big fan of pizza - and even eats it for breakfast on occasion (which makes her our kind of gal).

 Holly has slimmed down using a healthy diet and core exercises
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Holly has slimmed down using a healthy diet and core exercisesCredit: Social Media - Refer to Source

Holly is adamant that her lifestyle should be all about compromise and she regularly posts on social media about her vices, which include calorie laden cheese fondues and champagne.

The presenter is conscious of her status as a role model and avoids talking about her diet and she's  she "doesn't want to encourage eating disorders".

Boxing classes

Holly maintains her amazing figure with boxing classes, which can burn 300 calories every 30 minutes.

Typically costing £60 for a one-to-one session, the discipline builds stamina and core strength as well as giving a full body workout.

Celebrity Juice host Keith Lemon let it slip in an interview that he knows how Hols manages to keep fit.

He said: "I’ve heard a rumour that it’s some sort of boxing."

 Holly at the Brit Awards in 2015
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Holly at the Brit Awards in 2015Credit: Rex Features
 Holly is a fan of boxing classes according to Keith Lemon
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Holly is a fan of boxing classes according to Keith LemonCredit: Getty - Contributor

Her typical workouts are believed to involve shadow boxing, skipping and hitting pads.

And Holly is thought to don her gloves as often as three times a week, replacing her regular gym routine with the high impact workout.

Stretch it out

But Holly's workouts aren't all high impact.

After she gave birth to her daughter, Belle, seven years ago the new mum took up Pilates.

It was the perfect exercise for the busy mum as she could train at home with Lynne Robinson. with one to one sessions costing £60 an hour.

Lynne told The Sun last year: "I worked with Holly for several months, teaching her privately at her home once a week.

"Holly had postnatal mat work classes which concentrated on strengthening and toning her core".

 The former model is in the best shape of her life
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The former model is in the best shape of her lifeCredit: Rex Features

She explained that the exercises help the former model trim her waist and flatten the stomach.

Holly tried assisted curl ups, which use a pillow and a large towel to focus on alignment, lengthening the spine and connecting the deep abdominal muscles.

 Holly pictured in 2008, before having her three children
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Holly pictured in 2008, before having her three childrenCredit: Rex Features

Taking time to herself

We all know that it's important to take a breather every now and again to look after ourselves and Hol does too.

Now the mum-of-three's children are that bit older, Holly says she has more time to spend on herself.

She told: "I think as long as you’re happy and healthy that's most important."

It looks like there might be some tension between Holly and secret I'm a Celeb contestant Noel Edmunds, as he has previously branded her "aggressive, disrespectful and dishonest".

Phillip Schofield has also revealed that Holly has told him top-secret info about the show, but he is sword to secrecy.

Phil reveals Holly Willoughby has sworn him to secrecy over I'm a Celeb's late arrivals on This Morning