Prince Phillip's sweet reaction to Prince William and Kate Middleton's early split in their relationship is nothing short of a tear-jerking one.

As the royals celebrate their 10-year wedding anniversary today, William's late grandfather's reaction to the pair's initial split had royal fans reaching for the tissues.

The nation endured heartbreak when Buckingham Palace announced that the Duke of Edinburgh passed away peacefully on April 9, at the age of 99.

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But his wise words live on as fans around the world remembered his sweet reaction.

Turning to his wife the Queen during William and Kate's wedding in 2011, The Duke of Edinburgh said: "Thank goodness he didn't give her up."

William and Kate endured a few rocky bumps at the start of their relationship.

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After meeting at St Andrews university in Scotland, the pair formed a close friendship, which later blossomed into a deep romance.

However it was in 2007 when they first parted ways, after William reportedly ended their relationship with an hour-long phone call, per The Mirror.

The pair got back together 10 weeks later after realising they couldn't live without each other. Their wedding then came after an eight-year relationship.

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It comes as the pair have been flooded with well wishes and celebratory messages as they mark 10 years of their official union.

Her Majesty was among the well-wishers, sending a sweet message to her grandson and his wife.

Alongside a picture of the couple, the Queen wrote: "Wishing The Duke and Duchess of Cambridge a very happy wedding anniversary.

"Today marks ten years since Their Royal Highnesses exchanged vows at Westminster Abbey."

Meanwhile William's dad Prince Charles, and his wife Camilla also sent a message, which read: "Wishing The Duke and Duchess of Cambridge a very happy 10th wedding anniversary."

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The pair released two new images to mark the special day.

Snapped by photographer Chris Floyd, the heartwarming pictures show Will and Kate share a sweet embrace in the grounds of Kensington Palace.

Kate has now spent a decade as a fully signed up member of the royal family.

They now have three children: seven-year-old Prince George, Princess Charlotte, five, and three-year-old Prince Louis.

Featured image credit: PA Images / Alamy

Prince Philip's sweet reaction to William and Kate's reunion after their shock split years ago