"Crown Princess Mary already has quite a close friendship with the Princess of Wales. They share a lot of the same interests, and it's been commented upon by a lot of observers and journalists when you see them together during state or official visits that there's quite a natural rapport between the two of them," royal author Gareth Russell told an outlet.
"Crown Princess Mary is often referred to as the 'Kate Middleton of Denmark'. She's an immensely popular figure with the Danish public. Broadly speaking, the Danish royal family has very high approval ratings, and even within that, Crown Princess Mary has exceptionally high approval ratings. We can expect a close relationship between the new King Frederick X and Queen Mary and the Prince and Princess of Wales, which will continue the very close ties between the two monarchies that we saw with Queen Margrethe II and Queen Elizabeth II," Russell added.
He continued: "Those two used to use familiar nicknames for each other. Queen Elizabeth II called the Queen of Denmark Daisy, and she called her Lilibet. So it will be continuing on those close ties."
Kate and Mary have also won praise over the years for their similar styles.
Crown Princess Mary’s signature style is very classic and sophisticated. She often goes for simple lines and streamlined silhouettes. She manages to balance Scandinavian minimalism with Australian bohemianism very well," royal fashion website UFO No More's founders Sarah Williams and Heaven LeeMiller dished.
They added: "Her outfits always have a touch of trend or whimsy to prevent them from looking dull or boring."
Both the future queens of Britain and Denmark have routinely been compared to one another ever since their royal weddings in 2011 and 2004, respectively. Both consorts are commoners who married future kings, and both support many of the same causes and initiatives.
Crown Princess Mary will likely get to experience queenship long before her British counterpart, as both she and Crown Prince Frederik are set to accede to the Danish throne on Sunday, January 14, upon Margrethe II's "shocking" abdication. In what came as a surprise to royal watchers around the world, Queen Margrethe II announced her abdication for that date on New Year's Eve, despite previously stating that she would die in her role as Denmark's sovereign.
Frederik and Mary married in a lavish wedding in 2004 after a four-year romance. The future king of the Scandinavian nation first met Mary, an Australian advertising executive, during the 2000 Summer Olympics in Sydney, Australia. Their desire to wed received the blessing of Denmark's monarch and Frederik's mother, Margrethe II, in 2003.
GBN reported on Russell's remarks.