Prince William will be joining the Duchess of Cambridge, Kate Middleton, for a vacation in the Caribbean. The Duchess of Cambridge has already flown out to the island of Mustique with her family earlier this week. She traveled first-class via St Lucia, accompanied by two bodyguards, her parents and two siblings.

Prince William could not initially fly out with them because he could not get time off work. However, he is set to leave tomorrow after finishing his weekly shift as a Search and Rescue pilot in North Wales. A source told US Weekly, “He’s leaving tomorrow morning. It wasn’t set in stone because William needed to clear the week of work first.”

(Reuters/Mario Anzuoni)Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive at the BAFTA Brits to Watch event in Los Angeles, California July 9, 2011.

In the island of Mustique, which is a private island, Middleton’s family is to celebrate her mother Carol’s 57th birthday. Because the island is a private, the paparazzi are banned.

Prince William, a search-and-rescue pilot for the Royal Air Force, is expected to be deployed to the Falkland Islands next month for a six-week period, according to The Daily Mail.

Last weekend, Prince William and his brother Prince Harry also went to Spain for a weekend hunting trip.