They say the secret to a happy and long-lasting relationship is separate bathrooms.
But for Mariah Carey and her billionaire fianc? James Packer it seems the key is actually his 'n' hers yachts.

The Fantasy singer boasts a chartered 192ft yacht, Capri, which costs more than $340,000 per week.

But this is just a drop in the ocean compared to her casino mogul beau's 287ft expedition yacht, Arctic P - the seventh largest privately owned vessel in the world.

'It is important to have his-and-hers everything,' Mariah told ET.
Both mega-yachts are currently anchored together off the coast of Italy so the couple can enjoy the European summer.

Mariah revealed that she even took the plunge and went down the massive water slide that runs off Packer's massive yacht.
'I went down the slide, I'm not sure if I'll be doing it again,' she said.
The former icebreaker ship, which was converted to a private yacht by Packer's late father Kerry, needs a 40-strong crew.
It was recently renovated, with a hidden swimming pool, Jacuzzi and dining table added to the redesigned beach club.

The lavish floating palace has hosted a number of celebrities over the years, including Tom Cruise and Nicole Kidman.
Not to be outdone, Mariah's super yacht has six staterooms and six cabins which can house up to 12 guests.
The master suite has a king size bed and a spa pool bathtub in the his and hers private ensuite.
It also features two bars, a Jacuzzi, a gym, a library and a private chef.
The diva also spoke about how her five-year-old twins, Monroe and Moroccan, love swimming in the sea.