Kate Middleton, 35, is the wife of the second in line to the British throne, Prince William. The pair were married in 2011, and have two children, Prince George, 4, and Princess Charlotte, 2.
But the British royal has been compared to another foreign royal over and over again thanks to their very similar looks.
Head designer for Chanel Karl Lagerfeld called the women “royal sisters”.
Both women are famous for their royal love stories, both coming from ‘commoner’ backgrounds to marry into royalty.
It is well known Kate Middleton met Prince William at the University of St Andrews, where they were both studying. However, Mary met her royal husband Crown Prince Frederik of Denmark in different circumstances.

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The student had no idea the man she met was a royal, as her friends at the time did not manage to identify him.
Mary met Frederik the Slip Inn during the 2000 Summer Olympics on 16 September in Sydney.
The pair had a long-distance relationship over the phone, where their love blossomed. Like any royal family, the Danish royals guarded their privacy, but a year and a half after the couple met an announcement was made that the pair were officially dating.
One month later Mary moved to Denmark to be with her royal boyfriend. Two years later Frederik proposed to Mary with a ring that featured an emerald-cut diamond and two emerald-cut ruby baguettes.
Mary, Crown Princess of Denmark vital stats
Age: 45, (born 5 February 1972)
Height: 5’ 64”
Place of Birth: Hobart, Tasmania, Australia
Education: Bachelor of Commerce and Bachelor of Laws at the University of Tasmania, certificates in advertising from the Advertising Federation of Australia (AFA) and direct marketing from the Australian Direct Marketing Association (ADMA)
Career: Trainee in marketing and communications, then account manager and account director with advertising agency Young & Rubicam
Children: Prince Christian, 12, Princess Isabella, 10, Prince Vincent, 6, Princess Josephine, 6
Catherine, Duchess of Cambridge vital stats
Age: 35, (born 9 January 1981)
Height: 5’ 74”
Place of Birth: Royal Berkshire Hospital, Reading, Berkshire, England
Education: Undergraduate MA (2:1 Hons) in the History of Art from St Andrews University
Career: Former part-time accessory buyer with Jigsaw, full-time royal
Children: Prince George of Cambridge, 4, Princess Charlotte of Cambridge, 2
Princess Mary and Kate are known for their similar looks and tend to wear similar colours as their complexions are similar.
Bright colours suit the two stunning brunettes. Princess Mary stunned in bright magenta recently, a colour that Kate Middleton has worn on numerous occasions.
On October 9 Mary wore a white lace outfit that was strikingly similar to the ensemble Kate Middleton wore to Ascot this year.
Kate wore a white lace Dolce & Gabanna gown with a fascinator and nude shoes.