Kate Middleton and Princess Mary of Denmark are queens-in-waiting with much more in common than style. Take a look.

While she has been a Danish royal for two decades, Mary was born in Tasmania, Australia, in 1972. As People reported, Mary led a relatively normal life before she met Frederik at a pub in Sydney in 2000. At the time, she was working as an advertising executive.

Likewise, Kate did not come from an aristocratic background before she joined the British royal family. She was born in Reading, England, to parents Carole and Michael, who met through jobs in aviation before founding a successful party-planning business.

Before marrying William in 2011, Kate worked as an accessory buyer for Jigsaw and helped with her parents' business, Town and Country reported.

Mary and Frederik's wedding took place at the Copenhagen Cathedral on May 14, 2004. Their wedding was attended by an array of European royals and culminated in the couple kissing on the balcony at Christian VII's Palace as thousands of onlookers cheered.

Frederik wore a traditional Danish military uniform while Mary paid tribute to her new country by enlisting Danish designer Uffe Frank to create her ivory wedding dress made of duchess satin for the big day.

Seven years later, Kate and William tied the knot in a similarly traditional style. Their wedding took place at Westminster Abbey in London and was followed by an appearance on the Buckingham Palace balcony, where the couple shared a rare moment of PDA.

Like Mary, Kate paid tribute to her country with a custom-made dress designed by British luxury fashion house Alexander McQueen's creative director, Sarah Burton. The sleeves featured delicate floral embroidery that subtly paid tribute to the four countries that comprise the UK.

Besides having similar approaches to their wedding dresses, Kate and Mary have nearly identical fashion tastes — so much so that Karl Lagerfeld once told WWD he saw Kate as Mary's "younger sister."

Respective public appearances have shown they love elegant summer dresses, power suits, smart casual looks, and mixing up their wardrobe with high-street brands and luxury pieces. They have also been known to be fans of the same designers: Kate showed up at Wimbledon in 2021 wearing a Beulah dress Mary had worn in a similar shade to an art exhibition in Denmark two years prior.

Just as Kate has developed a reputation for recycling outfits, Mary has spoken about being a fan of sustainable fashion, the Evening Standard reported.

In 2021, she spoke of her support for secondhand clothing at the Copenhagen Fashion Summit as it "tells a history of the product — who's worn it before, where's it been, what's its journey."

Frederik and Mary share four children: Prince Christian, Princess Isabella, Prince Vincent, and Princess Josephine. When Margrethe abdicates, the couple's eldest son, Christian, 18, will become first in line to the throne behind his father.

Kate and William have three children: Prince George, Princess Charlotte, and Prince Louis. George, 10, is second in line to the throne behind his father and King Charles, his grandfather.

Mary and Kate have used their platforms as princesses to launch various charitable endeavors.

The Danish royal chairs The Mary Foundation, an organization she launched in 2007 to combat bullying, domestic violence, and loneliness, according to the Danish royal website.

Meanwhile, Kate is involved with several charities and patronages. According to the British royal website, her focus leans toward early childhood development and mental health.

Mary and Kate have also collaborated on charitable projects. In 2022, Kate joined William on a royal visit to Denmark, during which she accompanied Mary to the Danner Crisis Centre, which helps women and children affected by domestic violence.

When Kate and Mary's husbands become kings, they will technically become queen consorts — a title given to female spouses of reigning monarchs.

This is because the title of "queen" is usually given to reigning female monarchs, not the spouses of monarchs, BI's Samantha Grindell reported.

However, the title spouses of monarchs hold varies from monarchy to monarchy. Before she died in 2022, Queen Elizabeth II said she wanted Charles' wife, Camilla, to be known as "Queen Consort."

Meanwhile, Queen Margrethe II said in her abdication announcement on December 31, 2023, that Mary will be known as "HM Queen Mary" when Frederik ascends the throne.

Kate has weathered several royal scandals since becoming a princess in 2011.

These include — but are not limited to — her and William's reported strained relationship with Meghan Markle and Prince Harry, the couple's disastrous royal tour of the Caribbean in 2022, and most recently, Kate reportedly being named as one of the royals said to have made racially insensitive comments in the Dutch version of Omid Scobie's "Endgame."

Neither Kensington Palace nor Buckingham Palace responded to a request for comment from BI about "Endgame," which was pulled from bookstores in the Netherlands.

Meanwhile, Mary has dealt with her share of royal drama recently. In November, her relationship with Frederik was put under the microscope after Spanish tabloid Lecturas published a story showing photos of the Crown prince spending time with a Mexican socialite without his wife.

In a statement to Hola!, the socialite — Genoveva Casanova — denied suggestions of an affair and indicated she was taking legal action to protect her right to "honor, truth, and privacy."

Meanwhile, a representative of the Danish royal house told BI that they "do not comment on rumors and insinuations."