Prince William knows how to treat a girl right!

The future king of England whisked girlfriend of six years, Kate Middleton, away for a romantic getaway fit for a queen!

The couple holed up at the private $9.6 million Villa Rocina, located on the exclusive Caribbean island of Mustique for a week-long trip during a break in the Prince’s special forces military training.

On Aug. 9, William and Kate, both 26, wakeboarded, frolicked on a speed boat and cavorted on an inflatable raft during their first vacation in two-and-a-half years, leading to renewed speculation of an engagement!

"Everyone expects that when William finally proposes to Kate, it will be on Mustique," an insider says. "This is their favorite getaway place in the world."

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