That's the latest rumor across the pond now that the 24-year-old dancer has landed the cover of Tatler, which blares the headline "Harry Loves Cressy," branding their royal relationship official while inferring that the twosome is indeed getting serious.
Middleton herself didn't make the cover until 2011—eight years into her relationship with Prince William.
A stunning close-up shot of the blond beauty graces the cover of the society bible, which also shares 20 of Cressida's best-kept secrets.
Among the revelations? Her life motto is "treat others how you want to be treated," her favorite actor is Sean Penn and her drink of choice is rum on the rocks.
Harry and Cressida first sparked romance rumors in July 2012 when they cozied up together at the Dark Knight Rises premiere.
Seven months later, the couple was photographed showing some subtle PDA while on a ski trip in Switzerland.
So how did the good-looking twosome come to be a couple?
"They met through [Princess] Eugenie, who is friends with Cressida," a source told E! News back when word first surfaced that the two were dating. "Cressida is really smart, very naturally pretty and just a really cool girl to hang out with. It's hard for Harry to date as there are so many opportunities out there, but Cressida is someone he knows he can trust as she is already in his circle. She's already passed the test of being discreet."
Most recently, the twosome attended the wedding of Melissa Percy and Thomas van Straubenzee, where Harry's ex Chelsy Davy also served as a bridesmaid (a source told E! News it's "not awkward" for Harry's current and former flame, noting that Cressida and Chelsy have even become friends).
The source also said the 28-year-old royal and his gorgeous gal are "definitely more in love than ever," adding, "I would not be surprised if she's the one he marries."
"They are very affectionate with one another when they are with their friends," the insider said. "They kiss and cuddle and just seem head over heels for one another. They both have the same sense of fun and adventure. They're on the same wavelength. They are so compatible."
Now that the great Kate wait is over, let the next wedding-bell buzz begin!