What the Buckingham Palace? Kate Middleton with Prince Harry on Royal Wedding Mug

As a Royal Watcher, I’m constantly fascinated by the endless stream of souvenirs hitting the market to capitalize on the upcoming nuptials of Prince William and Kate Middleton. Nail polish, jigsaw puzzles, knit-your-own dolls—the tie-ins are endless.

But as companies continue to rush out everything from commemorative coins to mini Middletons, they occasionally make a royal boo-boo.

Take, for example, a new bone china mug from Guandong Enterprises, which, according to its site, was designed to “commemorate the wedding of HRH Prince William and his stunning lady bride-to-be Miss Kate Middleton.”

At first glance, the cup looks rather divine, with ornate gold detailing, a crown adorned with leafy branches, and two ovals surrounded by romantic pink piping. In one oval, there’s the beautiful, beaming future bride, wearing her blue Issa engagement-announcement dress. So pretty!

In the oval opposite her is the man of her dreams, her dashing prince, Harry.

Hold up … Harry?

Yup. Though the scroll beneath the photos is inscribed “Will & Kate,” the mug—which reads “The fairytale romantic union of all the centuries. 29th April 2011”—actually features Middleton with her future brother-in-law.

Eww! Or make that an, Awww, yeeeah!

Suddenly, I want one of these mugs with the groom goof-up, since surely it will be more valuable than the typical Will & Kate fare, right?

That may be the reaction Guandong had in mind.

According to the Telegraph, Guandong Enterprises, which purports to be a Chinese firm, is actually registered in Britain, so surely it should know its Wills from its Harrys.

Is it a spoof, a ruse to make the mugs seem more collectible, or just an honest-to-goodness royal screwup?

Doesn’t matter to me. I’m snapping up one of those £9.99 mugs (about $16 American) so I can sip my KaTEA as I watch Will, Kate, and yes, even you, Harry, make it official at Westminster Abbey next month.