Duchess Catherine and Princess Mary have been turning to each other for advice.
Duchess Catherine
The British royal - who is married to Prince William - and Mary, wife of Crown Prince Frederik of Denmark, have become good pals in recent years and are reportedly in close contact.
A source told Australia's New Idea magazine: "They are truly modern royal women, and this is an exciting time for both monarchies.
"They have spoken to each other about their coronations, pledging to work together and support each other through their transitions.
"They will confide in each other more over the coming months as they are at a very similar stage in their royal life.
"It's natural they would lean on each other."
Mary's husband Frederik is next in line to the Danish throne, while Prince William's father Prince Charles is just ahead of him in the British line of succession.
The royals have plenty in common and earlier this year Mario Testino - who took William and Catherine's engagement photographs - spoke about photographing Frederik and Mary for Vogue Australia.
Alongside an image of the husband and wife - who married in 2004 and have sons Christian, 10, Vincent, five, as well as daughters Isabella, nine, and Josephine, five - he wrote: "SUCH A PLEASURE SHOOTING HRH CROWN PRINCESS MARY AND HRH CROWN PRINCE FREDERIK OF DENMARK FOR THE COVER OF @vogueaustralia
"UN GRAN PLACER FOTOGRAFIAR A SAR LA PRINCESA HEREDERA MARY Y SAR EL PRINCIPE HEREDERO FREDERIK DE DINAMARCA PARA LA PORTADA DE VOGUE AUSTRALIA (sic)."
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