Thurlow, 25, joined the redheaded royal, 29, for a vacation on a luxury yacht, which began on Saturday, Aug. 23, in Saint-Tropez, France with a few friends. They are traveling with pal Ben Goldsmith and his model financée Jemima Jones.
"This trip's partly to celebrate Harry's 30th birthday which is just weeks away," a source explains to Us. Prince William's younger brother will celebrate his milestone 30th on Sept. 15. "It's also because he deserves some time off work to relax and recharge his batteries." Harry has been busy organizing the Invictus Games, held Sept. 10 through 14.
After he was first seen kissing Thurlow at a nightclub in July, Harry chose to bring his new love interest along for his time off. "They stayed in touch via text after the first night they kissed," a second source tells Us, about the couple who was spotted locking lips in London.
"It's a sign that he's really smitten with Camilla that he feels comfortable to invite her away with friends he's known for years," the first insider adds to Us.
The group of pals will be traveling in style, as the impressive liner boasts a luxe master suite, six other bedrooms, an on-deck jacuzzi, gym, swimming platform, and helipad.
After he unwinds, the young royal may be considering what's ahead for him in his personal life. A third source tells Us Weekly that Harry "is keen to settle down" and "thinking about what he wants in life." This reflective period follows Harry's split from longtime girlfriend Cressida Bonas this past April.
Now, his goals could include a future with Thurlow, who is a former Miss Edinburgh and works as a projects officer for The Halo Trust, a UK nonprofit which was once a project close to the heart of Harry's late mother, Princess Diana.
Kensington Palace had no comment on the romantic getaway. See more pics of Prince Harry through the years.