Another low-key wedding anniversary for Will and Kate

It's your third anniversary today, Will and Kate, so what are you doing to celebrate?

None of our nosy business, says Kensington Palace, only more politely.

If pictures can be believed, it looks like the marriage of the Duke and Duchess of Cambridge is a roaring success so far, as successful as the wedding itself. Photographers who snapped them recently say they still look and act as if they're deeply in love.

Still, it looks like another quiet night in for Prince William and Duchess Kate on the third anniversary of their nuptials on April 29, 2011.

Just like the previous two anniversaries. This royal couple is not known for regularly painting the town.

Maybe it's because the wedding of the second-in-line to the throne and the former Kate Middleton was such an over-the-top extravaganza, watched by billions and lasting for days.

Or maybe it's because the couple and their 9-month-old baby, Prince George, have just returned (on Saturday) from an exhausting three-week tour of Down Under, one of the longest and most successful overseas royal tours in decades, with dozens of engagements, flights and outfit changes.

Getting there and back required two 24-hour-plus flights with an often fussy baby. The jet lag alone can be brutal.

And this couple doesn't always do the usual or conventional thing. They took their honeymoon a week after the wedding, for instance, and right before the Down Under tour and their 2012 South Asia tour, they took brief vacations to rest up. Even on major birthdays, they have not been seen celebrating in public, at least not by the paparazzi.

Whatever the reason, don't expect to see them clubbing for their third anniversary. Nor will you worm any details from the palace on who gave what to whom. The royal press officers never comment on these "private" matters.

But that doesn't stop the media, who regularly comment to a fare-thee-well.

The latest from papers such as the Daily Mail, the Telegraph and the Australian report that in New Zealand and Australia, Kate was seen wearing her gift from Will, a $5,000-plus Ballon Bleu de Cartier watch. It features a sapphire cabochon in the winding mechanism to match her engagement ring, the one that belonged to Will's mother, the late Princess Diana, who also wore a Cartier watch.

Something made of leather is the traditional gift for a third wedding anniversary. But these young royals aren't always traditional.

But they're still in love, says a New Zealand wedding photographer who took the sweet shot of the trio together, George cuddled on his mother's shoulder, during a playdate in Wellington two days after they arrived Down Under. Simon Woolf, the Kiwi government photographer who was at every event with them in New Zealand, told People magazine he was told the snap was the couple's favorite of the tour.

The picture, Woolf says, summed up the royal couple's relationship.

"That photo represented the lovely closeness of the family," Woolf told the magazine. "I was so totally reassured that it is a great relationship…I have been a wedding photographer for most of my life and I know when two people love each other deeply and that's what I saw."