Princess Charlotte and Prince George are reportedly on holiday with their parents for the first time as a family of five

Princess Charlotte, Prince George and their little brother Prince Louis are reportedly on holiday with their parents, which is the first time they've been away as a family of five.

It's been an eventful few months for the Cambridges, who have welcomed another little one into their brood, had his christening just a few weeks ago, and participated in the most watched wedding of the year.

After such a busy period, it's no wonder the couple and their children are in need of some relaxation away from official engagements, where they can have fun as a normal family.

And it sounds like they're doing just that, as it's believed they have left the UK and headed to the small and exclusive island of Mustique, in the Caribbean.

The news originally came from a royal blogger, who got a tip from a follower on Instagram saying that they saw Kate, William and their little ones on their way to St. Lucia, and it was later reported by Hello! magazine.

They said on a tweet: 'A lovely follower on Instagram messaged me that her friend spotted The Cambridges along with The Middletons on their way to Vacation in St. Lucia!

'They mentioned the Cambridges then got off the plane and went on a private one to their next destination. My best guess is they’re on their way to Mustique.'

If rumours are true, this the Cambridges first holiday as a family of five, since they welcomed little Prince Louis in April. The last time it was confirmed they took a trip as a family was in 2016, when they went on a skiing holiday with George and Charlotte.

It's been a busy year for the Cambridges

Mustique is a popular destination for Kate and William, who have previously visited the private island with Kate's family a few times.

According to Hello!, the last William and Kate joined the Middletons in the Caribbean was in 2015, four months before she gave birth to Princess Charlotte.

With Prince George turning five on Sunday, this would also mean the little prince would be celebrating his birthday in style!