Hollywood royalty Catherine Zeta-Jones and Michael Douglas are now living in St James's Palace

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Royalists Catherine Zeta-Jones and Michael Douglas have reportedly moved into a new apartment inside St James's Palace.

The Hollywood superstars are now a stone's throw from the home of the King and Queen Consort, while Princesses Anne and Beatrice are even closer neighbours.

The couple, who are ardent monarchists, are understood to have rented a flat at London's oldest palace recently to be their base in the city.

One insider said: 'It's just perfect for their requirements when they're visiting the capital.' 

A one-bedroom flat at the palace, likely to be much smaller than the couple's, is currently on the rental market for just under £4,000 a month.

Rentals within the palace first became available in 2015.

Royalists Catherine Zeta-Jones and Michael Douglas have reportedly moved into a new apartment inside St James's Palace

The St James's Palace detachment of The Queen's Guard turns out in Colour Court, St James Palace, back in 2013

At the time, a source said: 'In theory, anyone can apply but all prospective tenants will be subject to security and background checks.'

St James's Palace was built by Henry VIII in the 16th century. 

Zeta Jones and Fatal Attraction star Douglas, 78, have a son, Dylan, 22, and daughter, Carys, 19. 

They previously divided their time between a £4million mansion in Irvington, New York state, and a 12-bedroom holiday home in Majorca. They are also thought to own properties in Bermuda and Canada.

The Hollywood superstars are now a stone's throw from the home of the King and Queen Consort, while Princesses Anne and Beatrice are even closer neighbours.

Zeta-Jones spoke this week about her admiration for the Royal Family and revealed that she had once had lunch with Queen Camilla.

'I'm a massive royalist,' she said.

'In our family, we'll dress up on royal occasions. My son will wear a top hat and tails and have scones.

'I had a wonderful lunch with Camilla and Lady Astor in New York years ago, before they were even married, and I loved her. What you see is what you get with Camilla.' 

A one-bedroom flat at the palace, likely to be much smaller than the couple's, is currently on the rental market for just under £4,000 a month. Rentals within the palace first became available in 2015

The christenings of the Prince and Princess of Wales's sons, Prince George and Prince Louis, were held at the Chapel Royal at St James's Palace. 

Prince Charles was proclaimed King at the palace.

As the son of Hollywood legend Kirk Douglas, Michael grew up in luxury in New York, while Zeta-Jones was raised in a semi-detached house in Swansea, South Wales. 

Her parents won £100,000 in a bingo game which paid for their daughter's dance and ballet tuition and launched her career.

Hollywood star looks unrecognisable as she rides the Tube – so can you work out who it is?

She went from the Mumbles district of Swansea to the bright lights of Hollywood.

Yet this Hollywood star proved she hadn't forgotten her humble roots as she filmed herself on the London Underground on Tuesday.

She might be more at home in Chicago than in London and in The Terminal of airports ahead of boarding private jets, but her public transport use ensured she beat the Traffic in the big city. 

Plus the 53-year-old film star managed to nab the entire carriage to herself so she wasn't mobbed by any fellow travellers.

So can you guess who it is?  

Out and about: Catherine Zeta-Jones showed she is still one of the people as she filmed herself on the London Underground on Tuesday

Trip: The film star, 53, wasn't spotted by any fellow travellers as she had the entire carriage to herself

That's right, it's Catherine-Zeta Jones! 

Catherine kept a low profile as she sported a large pair of sunglasses, a grey hat and scarf during the trip.

Speaking to the camera, she said: 'When you're the only one on the tube and you're very happy. London, just me, on public transport.'

Alongside the clip, she wrote: 'Tube Time! London Transport!'

Catherine, who is married to fellow A-list actor Michael Douglas, is thought to have a net worth of $150million.

She was paid an impressive $3million for her role in Traffic in 2000 and earned $million for Chicago just two years later.

The star has also made millions from endorsements such as her deal with T-Mobile where she earned a reported $10million.

In addition, Catherine has millions tied up in properties she shares with her husband Michael. 

Incognito: It appeard Catherine did wish to keep a low profile however as she sported a large pair of sunglasses, a grey hat and scarf during the trip

It comes after Michael detailed how he and Catherine manage to juggle family life with A-list acting gigs.

The actor, 78, explained that, particularly when their children were young, they have always tried to take big jobs at different times to avoid conflicting schedules.

He and Catherine, who tied the knot back in 2000, share two children, Carys, 18, and Dylan, 20. While Michael is also dad to Cameron, 44, from his marriage to Diandra Luker.

Insisting that there's no competition between the Hollywood couple, Michael explained that they simply work on their own projects.

Family: It comes after Catherine's husband Michael detailed how the pair manage to juggle family life with A-list acting gigs (pictured with children Carys, 18, and Dylan, 20)

Speaking on ITV's Lorraine, he said: 'I don't know about that [competition].. I think we both do our own things.

'We try and do it at different times so when the kids were younger, so we could be there. But no competition, Catherine's going to do another year of Wednesday and a lot of other projects right now.

'Truth be told, my kids couldn't see the films I've made. 

'It's another generation of fans, it's as close as you get to immortality, a bunch of kids now know who you were before, that part is fun,' he jested.