Rare footage of Princess Diana competing in a running race for Prince Harry has surfaced online

It's hard to believe, but it has been nearly three decades since Prince Harry first started school.

And somehow, only 29 years later, has a sweet video of his mother Princess Diana running in a race as part of Wetherby School's annual sports day surfaced online.

But we're glad the rare clip has gone viral, as it has given us a fresh glimpse into the late royal's doting relationship with her sons.

The footage has captured the moment the "People's Princess" could be seen sprinting barefoot towards the finish line alongside other mums.

The clip, which was shared on Twitter, is dated 1989, but when comparing old photos, the event actually took place in June 1991.

The post also states Diana was there to support Prince William, but it was actually young Harry.

And according to the Huffington Post, the footage wasn't her first race; she previously competed in 1989 and 1990.

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She is believed to have placed second in 1989 and third in 1990.

And royal fans are loving getting to see a glimpse of normalcy within the family.

"She was always breaking Royal protocol... She had such a beautiful soul and heart," wrote one Twitter user.

Another said: "Imagine running a Mother's Day school race and you look over to see Princess Diana zooming past you."