Kate Middleton and Prince William partied on a rare night out in Mustique

If you thought royals don't know how to party, think again. Kate Middleton and Prince William reportedly let loose for a night out in Mustique, the private Caribbean island where they're currently vacationing with their family.

The couple is on the trip with their three young kids—Prince George, Princess Charlotte, and Prince Louis—and Kate's parents, but it seems they were able to get away for a bit to enjoy some time to themselves.

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Prince Louis' christening
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Prince Louis' christening
LONDON, ENGLAND - JULY 09: Princess Charlotte and Prince George hold the hands of their father, Prince William, Duke of Cambridge, as they arrive at the Chapel Royal, St James's Palace, London for the christening of their brother, Prince Louis, who is being carried by their mother, Catherine, Duchess of Cambridge on July 09, 2018 in London, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
The Duke and Duchess of Cambridge with their children Prince George, Princess Charlotte and Prince Louis after Prince Louis's christening at the Chapel Royal, St James's Palace, London.
The Duke and Duchess of Cambridge with their children Prince George, Princess Charlotte and Prince Louis after Prince Louis's christening at the Chapel Royal, St James's Palace, London.
The Duke of Cambridge with Prince George and Princess Charlotte after Prince Louis's christening at the Chapel Royal, St James's Palace, London.
Britain's Catherine, the Duchess of Cambridge, carries Prince Louis as they arrive for his christening service at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
Britain's Catherine, the Duchess of Cambridge, carries Prince Louis as they arrive for his christening service at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
Britain's Catherine, the Duchess of Cambridge, carries Prince Louis as they arrive for his christening service at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
LONDON, ENGLAND - JULY 09: Catherine, Duchess of Cambridge carries Prince Louis as they arrive for his christening service at St James's Palace on July 09, 2018 in London, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
The Duke and Duchess of Sussex depart after attending the christening of Prince Louis at the Chapel Royal, St James's Palace, London.
The Duke and Duchess of Cambridge with their children Prince George, Princess Charlotte and Prince Louis after Prince Louis's christening at the Chapel Royal, St James's Palace, London.
Pippa Middleton and her husband James Matthews arriving for the christening of Prince Louis, the youngest son of the Duke and Duchess of Cambridge at the Chapel Royal, St James's Palace, London.
The Prince of Wales and the Duchess of Cornwall arriving for the christening of Prince Louis, the youngest son of the Duke and Duchess of Cambridge at the Chapel Royal, St James's Palace, London.
Britain's Prince Harry and Meghan, the Duchess of Sussex, leave the chapel after the christening of Prince Louis at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
James Matthews arrives for the christening of Prince Louis, the youngest son of the Duke and Duchess of Cambridge at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
Pippa Middleton and her husband James Matthews, arrive for the christening of Prince Louis, the youngest son of the Duke and Duchess of Cambridge at the Chapel Royal, St James's Palace, London, Britain, July 9, 2018. Dominic Lipinski/Pool via REUTERS
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The Duke and Duchess of Cambridge were spotted out for a party at Mustique's Basil Bar, which was also attended by Mick Jagger and his daughter Jade, sources told Hello!. The couple is friends with the bar's founder, Basil Charles.

The Cambridges arrived "on the early side" of the soirée sporting "island chic" outfits (William wore a shirt from a local brand), according to witnesses. "They were there for the cocktails segment and kept it rather classy," a source said.

The Duke and Duchess have been traveling to Mustique since 2008, Hello! reports, which was years before their wedding in 2011. This trip is their first time visiting the island as a family of five, as they just welcomed baby Prince Louis in April. They reportedly left for Mustique in mid-July after they were spotted at an airport in St. Lucia.

Nights out for William and Kate's might be rare (at least as far the public knows), but they also got their party fix in May after Prince Harry and Meghan Markle's wedding. At the private evening reception, William reportedly had a dance-off with his father and brother, and Kate got to dance with George Clooney.

The next morning, they were seen returning to Kensington Palace wearing big sunglasses—a true sign of a night well spent.

Kate and William at this year's Wimbledon

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Duchess Kate and Prince William at Wimbledon finals
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Duchess Kate and Prince William at Wimbledon finals
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Prime Minister Theresa May and Philip May attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Sophie Winkleman and Catherine, Duchess of Cambridge attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prime Minister Theresa May attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prime Minister Theresa May attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's single final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge attends the men's singles final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge reacts as they attend the men's singles final on day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)
Britain's Catherine, Duchess of Cambridge jokes with her husband Britain's Prince William, Duke of Cambridge in the Royal Box before South Africa's Kevin Anderson plays Serbia's Novak Djokovic in their men's singles final match on the thirteenth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 15, 2018. (Photo by Glyn KIRK / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP/Getty Images)
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Clive Brunskill/Getty Images)
Britain's Catherine, Duchess of Cambridge sits in the Royal Box before South Africa's Kevin Anderson plays Serbia's Novak Djokovic in their men's singles final match on the thirteenth day of the 2018 Wimbledon Championships at The All England Lawn Tennis Club in Wimbledon, southwest London, on July 15, 2018. (Photo by Glyn KIRK / AFP) / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP/Getty Images)
LONDON, ENGLAND - JULY 15: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend day thirteen of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 15, 2018 in London, England. (Photo by Karwai Tang/WireImage )
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