Prince William honors Princess Diana with never-before-seen childhood photo on UK Mother's Day tribute

Prince William is honoring his late mother Princess Diana on Mother's Day in the U.K. 

On Sunday, the 43-year-old royal took to social media to share a never-before-seen photo of him and the late princess.

"Remembering my mother, today and every day. Thinking of all those who are remembering someone they love today. Happy Mother’s Day. W," he captioned the photo on Instagram, which featured a young William and Diana in a field of flowers. 

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