Kate Middleton, Prince William
Kate Middleton and Prince William may be in Mustique with their three children and Middleton's parents. Pictured: Middleton, Prince William 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. Getty Images/Clive Brunskill

Prince William and Kate Middleton are rumored to be vacationing in Mustique with their children.

According to Harper’s Bazaar, the royal family was spotted arriving in St. Lucia and then boarding a private flight to the Caribbean island of Mustique. Twitter user Tea Time With the Cambridges also posted about the family’s alleged sighting.

“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!” the tweet read.

The publication noted that Middleton’s parents, Michael and Carole Middleton, joined them on their holiday vacation. However, Pippa Middleton and James Matthews didn’t because Pippa is pregnant with their first child.

Mustique is a private island in Saint Vincent and the Grenadines, which is about 100 miles away from Barbados. The getaway is so secluded that it has been declared as a no-fly zone. There are only about 100 villas on the entire island.

If proven to be true, this isn’t the first time that Prince William and Middleton vacationed in Mustique. The Duke and Duchess of Cambridge went to the same place for their holiday in 2012. Middleton also took Prince George to the breathtaking island in 2014. The Duchess’ parents also frequent the place.

In related news, Prince William and Middleton were last seen in public at the Wimbledon Men’s Singles Final on Sunday, July 15. The couple watched the tournament from the Royal Box. Middleton wore a yellow dress while Prince William wore a blue suit.

Once seated, Middleton and Prince William shared laughs and smiled at each other before Novak Djokovic and Kevin Anderson’s match started.

Middleton regularly attends Wimbledon even before she married Prince William.

“It is such a quintessential part of English summer. I was really taken by Agassi and Sampras, Ivanisevic and Steffi Graf. That for me was my first memories,” she told People in the past.

A day prior to Middleton and Prince William’s sighting, she attended the Women’s Singles Finals with Meghan Markle. The two Duchesses were also photographed laughing during the game. Serena Williams lost to Angelique Kerber in the game.