THE ROYAL family are known to have very strict rules to follow - especially when in public.
From not walking in front of certain members of the family to having to wear tights, there's a number of rules the royal must adhere to, but it seems not everyone does.
Kate Middleton
And it seems not even the Princess of Wales is innocent of breaching royal protocol at times - but can you spot what it is?
Earlier this year Kate Middleton, 41, attended the Easter service wearing a blue coat dress and matching hat.
While at first glance her outfit appears normal - it seems Kate decided to break a rule for the occasion.
The mother-of-three had her nails painted dark red in contrast with the neutral or clear shades she usually wears for public appearances.
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Although the women of the Royal Family are allowed to wear nail polish, they have to follow strict rules.
"It needs to be skin coloured so hot red and bright pink, for example, are not correct, especially for official occasions and particularly during mourning," Etiquette expert William Hanson says.
"So it's either translucent or dusky pink - so that would basically be the colour of your nails so it looks natural."
But Kate isn't the only one who has broken the real, here we look at other royal women who have dared to add colour to their nails.
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Meghan Markle
Meghan Markle glowed in asymmetrical Givenchy dress as she presented a prize to Clare Waight Keller at the 2018 British Fashion Awards, the designer who had done her wedding dress earlier that year.
It was an elegant look finished with a stack of gold bracelets and a slicked-back ponytail - but at closer inspection the working royal family member broke protocol.
Pregnant at the time, the Duchess of Sussex could be seen rubbing her baby bump, her hands decorate with a deep red nail polish - something to be avoided.
Princess Diana
The late Princess Diana kept to the neutral polish rule the entirety of her marriage to King Charles.
However, once it was over she reverted back to bright shades of polish.
Stepping out in her infamous black 'revenge dress' Dianna paired the look with bright red nail polish.
The same evening King Charles's(Prince of Wales at the time) admission of adultery had been broadcast.
Christina Stambolian wrote: "She was clearly angry […] She wore bright red nail enamel, which we had never seen her do before. She was saying: 'Let's be wicked tonight," reports .
Sophie, Duchess of Edinburgh
The 58-year-old Duchess has been spotted on numerous occasions wearing nail polish that doesn't fit royal protocal.
Sophie, married to the late Queen's son, the Duke of Edinburgh, Edward has been spotted in berry-coloured nail varnish, as well as red and pinks.
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Here, she can be seen with pink nails while attending a service to celebrate the 75th anniversary of the NHS at Westminster Abbey in July.
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