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The Love Island cast are going to be shaken to their perfectly defined cores as the show undergoes the biggest shock twist in its history.

As exclusively revealed to Mirror Online, an explosive twist is set to be announced this week – and will be the greatest test of loyalty that the couples could possibly experience.

Because each of the couples are set to be SPLIT UP - with half the islanders having to pack their bags and move into a second, secret villa.

"They're going to split all the boys and girls up so they'll be in separate accommodation," a source close to the ITV2 programme told Mirror Online, adding that all the girls will be in one house and the boys will be in the other.

(Image: ITV) (Image: ITV) (Image: Rex Features)

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"Even more newbies are going to be sent in this week to shake things up. It's going to be the biggest thing to happen to the show."

Our insider revealed how the twist will come as a complete shock to the islanders and is designed to test the relationships that have already been formed – and, of course, make excellent television.

"Because of the villa's remote location, the second house will be in the same town but is far enough away that both groups can get up to whatever they want," our source went on.

(Image: ITV)

"The secret location is going to be used for two or three days and new girls will be sent into the boys' house to test them, and new boys will go into the girls' house. It's to test the loyalty of current relationships and it's going to be explosive."

It's thought the producers want to make this the ultimate challenge for those who have started falling for their partner already - as well as give the new islanders their own opportunity to find love.

Fans of the show will get to watch as the coupled up cast mates get their head turned - or decide to stick with the person they fancied from the last recoupling.

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(Image: ITV)

What's more, the rumours of Jessica Shears and Mike Thalassitis going back into the villa are thought to be FALSE and are being used as a smokescreen while Love Island bosses sort out the final details of the secret house.

Caroline Flack had hinted at a twist in last night's Love Island: Aftersun, but many thought she was referring to Jessica and Mike.

(Image: Instagram)

(Image: Instagram)

What's more, this latest twist could leave the plans for the next recoupling in tatters.

It's thought the secret location will be used for up to three days, before the whole cast is reunited at the end of the week.

But which of the couples will survive their enforced stay away from each other?

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Previously, rumours of a second 'nookie nook' had swirled - but it was presumed this other location would act as an extension of the Hideaway and be used by couples wanting more privacy.

But the secret villa will actually play just as active a role as the first house in putting pressure on the islanders to play the game - and decide whether they've got a better shot at the £50,000 prize by coupling up, or take a gamble and stay single.

Mirror Online has contacted Love Island for comment.

Love Island continues tonight at 9pm on ITV2.