Kate Middleton and Prince William mark their 9th wedding anniversary with romantic photo

Happy anniversary, Kate and William!

On Wednesday, the Duke and Duchess of Cambridge marked their ninth wedding anniversary by sharing a sweet throwback of their big day. The photo was taken as the couple was leaving their wedding ceremony at Westminster Abbey, with the duchess beaming in her now-iconic Alexander McQueen lace wedding dress.

"🎊 Nine years ago today – thank you for all your lovely messages on The Duke and Duchess of Cambridge’s wedding anniversary!" the photo caption read.

The 2011 nuptials, which was declared a national holiday in the United Kingdom, proved to be the ultimate fairytale wedding -- with the numbers to prove it. It had three billion viewers around the world, included a Victorian-inspired wedding gown that royal experts say cost over $400,000 and a massive floral budget of $1.1 million.

In honor of the royal couple's big day, we're taking a look back at the best moments from their royal wedding in the gallery above.

The couple, who met at St. Andrews in Scotland, is currently on coronavirus lockdown at their Anmer Hall home with their three children. Kate and William have taken on homeschooling their two eldest children, George and Charlotte, for the time being, which they say has been "challenging."

"Someone gave me some very good advice, pre the [Easter] holidays, to fit some structure to keep to a pretty strict routine," Kate said in a video interview earlier this month. "Don’t tell the children, we’ve actually kept it going through the holidays. I felt very mean.”

"The children have got such stamina," the royal continued. "You pitch a tent, take the tent down again, cook, bake. You get to the end of the day—they've had a lovely time, but it's amazing how much you can cram into a day, that's for sure."

The Cambridges also say they've tried to explain the pandemic to their kids as best they can.

"It's been ups and downs, probably like lots of families self isolating," Kate explained. "George is much older than Louis is and things, but they are aware."

"You don't want to scare them and make it too overwhelming, but I do think it is appropriate to acknowledge it in simple ways," she continued.

Like most families, the couple has been relying on Facetime to keep in touch with friends and loved ones.

"It gets a bit hectic, I'm not going to lie. With a two-year-old you have to take the phone away," Kate said. "But it's nice to keep in touch with everybody."