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Viewers were left gobsmacked this evening as a 28-year-old clip resurfaced of a young Meghan Markle criticising a sexist advert.

The Duchess of Sussex appeared on children's channel Nickelodeon when she was just 12 in 1993 as she voiced her concerns over a commercial.

In the brief clip, Meghan shows her passion for women's rights began at a young age as the pre-teen says she was "furious" over the ad and wrote a letter to the company.

"I knew something had to be done because I was furious," she says about the commercial – which referred to "women are fighting greasy pots and pans".

In her letter to the company, Meghan referred to her class at school watching the news for social studies when the ad popped up.

Meghan Markle appeared on Nick News aged just 12 years old
(Image: YouTube)

"When I heard this, the boys in my class started saying, 'Yeah, that's where women belong – in the kitchen,'" Meghan says.

Sitting with her female classmates, an eloquent Meghan continues: "It makes me think that they're going to grow up thinking that girls are less than them – you know, like boys are better than girls."

Three months after Meghan wrote to the company, the commercial was changed, with the word "women" replaced by "people".

Meghan will celebrate her 40th birthday next month
(Image: PA)

Offering advice to viewers, a young Meghan says: "If you see something that you don't like or are offended by on television or any other place, write letters and send them to the right people and you can really make a difference for not just yourself but lots of other people."

The sweet clip briefly aired during a new Channel 5 documentary, which charts the Duchess of Sussex's life and rise to stardom ahead of her 40th birthday next month and examined what her legacy could look like.

The Duchess of Sussex was passionate about women's rights from a young age
(Image: PA)

Royal commentators also suggest that Meghan's explosive interview with Oprah Winfrey might be one she lives to regret.

The interview divided opinion on Meghan and Prince Harry, with some celebrating that they had lifted the lid on the inner workings of the Royal Family, while others have said it was tantamount to treason for being so honest.

Speaking on the Channel 5 programme, royal author Tom Quinn said: "I think the problem for Meghan was that she was angry, she was upset.

Harry and Meghan left the royal family for good in February
(Image: SIPA USA/PA Images)

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“I think that she thought when she entered the Royal Family she could shake them up and they would love it, she would do things Meghan’s way."

He continued: "When that didn’t happen and she came up against what she saw as the forces of reaction it made her so upset that, that interview was her way I think the only way for her to get her revenge and put the case as she saw it.

"But I think later on she will think I shouldn’t have burnt my bridges to that extent."

*Meghan at 40: Climb to Power is available to rewatch on My5