Happy anniversary, Prince William and Kate Middleton!

The Duke and Duchess of Cambridge celebrated nine years of marriage on Wednesday.

Their royal household, Kensington Palace, marked the major milestone by posting a special tribute on Instagram.

"Nine years ago today," the post, which featured a photo of the couple on their big day, read. "Thank you for all your lovely messages on The Duke and Duchess of Cambridge's wedding anniversary!"

William and Kate wed at Westminster Abbey in London on April 29, 2011. The bride wore a gorgeous gown by Alexander McQueen's creative director Sarah Burton and the Cartier "Halo" tiara. She carried a bouquet of myrtle, lily-of-the-valley, sweet William, ivy and hyacinth as she walked down the aisle, which was lined with eight 20-foot-high trees. William's brother, Prince Harry, and Kate's sister, Pippa Middleton, were both in the wedding party.

After the ceremony, the newlyweds traveled throughout the streets of London in a horse-drawn carriage procession. Their Royal Highnesses then shared their first public kisses as husband and wife on the balcony of Buckingham Palace. Queen Elizabeth II hosted a reception for William and Kate at Buckingham Palace, and Prince Charles hosted a private dinner for the pair that evening.

Fast-forward almost a decade later and William and Kate are the proud parents to three children—Prince George (6), Princess Charlotte (4) and Prince Louis (2)—and continue to fulfill their royal duties. 

To look back at the couple's royal wedding, check out the gallery below.

Official Wedding Portrait, Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Kate Middleton

Hugo Burnand/Clarence House - WPA Pool/Getty Images

 Prince William, Kate Middleton, Duchess Catherine, Wedding

Tim Rooke/REX/Shutterstock

Prince William, Kate Middleton, Pippa, Prince Harry, Wedding Departure

Prince William, Kate Middleton, Royal Wedding Alter

Dominic Lipinski/PA Images via Getty Images

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Kate Middleton, Wedding

Back Page Images/REX/Shutterstock

Prince William, Kate Middleton, Royal Wedding, Kiss

AP Photo

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Kate Middleton, Wedding

REX/Shutterstock

Kate Middleton, Prince William, Royal Wedding, Ninja Nun

Anthony Devlin - WPA Pool/Getty Images

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Kate Middleton, Queen Elizabeth, Prince Philip, Royal Wedding

Hugo Burnand/Clarence House - WPA Pool/Getty Images

Prince William, Kate Middleton, wedding, car

Chris Ison/PA Images via Getty Images

Congratulations, you two!

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