Which leads to the question of who will receive the coveted commission. HELLO! Online has picked out the photographers who may be in contention because of their links with the royal family.
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Hugo is the frontrunner after taking the Duke and Duchess of Cambridge's wedding photos. He also had that honour when Prince Charles tied the knot with the Duchess of Cornwall.
His ambition when capturing a moment, however, formal the setting is making the viewer feel they could be in conversation with that person.
A master at making his subjects, especially little ones, feel at ease, he allowed Camilla's granddaughter to hold on to a bright pink 'wiggly worm' during photos for the 2011 royal wedding.
His team which includes his 71-year-old mother Ursy also had a supply of jelly beans and sweets on hand.
Of the royal couple, he says: "I love them. They are so b***dy nice. They are just so nice as individuals and as a pair, and they work so well together."
The Peruvian photographer is famous for his glamorous, dreamy look shots of celebrities. Mario famously shot the Vanity Fair cover of Princess Diana, in which she appeared like a Hollywood star.
Radiantly beautiful, without the trappings of royalty or even shoes on, she later confided that her boys thought it was "the most 'her' they had seen her."
An unabashed lover of the A-list life, he "adores" going to the Oscars and know "every single person at the party afterwards".
His pictures for William and Kate's engagement were published around the world.
He captured the royal family on camera for the diamond anniversary of the Queen and Prince Philip in 2008 – the first time three generations of Windsors had been photographed together.
In all in his 30-year career, Tim travelled to 100 countries with the monarch and her children.
Privileged access to the royals on their state visits allowed him to record festivals, feats of horsemanship, folk dances, durbars, parades, tribal gatherings and local people in colourful national costumes.
His career started when he forgot to switch on the flash while waiting to secure a snap of the Queen Mother. Hearing him groan in dismay, she stopped and asked him if he wanted another shot. "I was eighteen years old, just started in the job, and it is an incident I have never forgotten," he said.
Paul is the official photographer to Prince Charles. In 2000, he became the first ever photographer to be awarded a royal warrant allowing him to use the Prince Of Wales feathers and the wording by 'royal appointment'.
He took wonderfully natural pictures of Kate when she stepped in for her father-in-law on her first solo engagement.
Joth would be the outside choice - but not completely unlikely because of Kate's artistic bent as a keen amateur photographer herself. He takes striking black and white shots, with subjects varying from tribal peoples to society weddings. HELLO! columnist Tamara Beckwith chose him to take shots of her romantic Venetian wedding to Giorgio Veroni.
A regular HELLO! photographer, John began his career working for Vogue and the legendary David Bailey. The Queen sat for him during her Golden and Diamond Jubilees.
The first time he took her portrait was "really scary".
He says of his most famous subject: "In a way nobody really gets to know the Queen because she is not aloof – she is with you trying to make the picture work – but she is the Queen.
"She is special. You can't put it out of your head, you can't pretend she is normal because she is not – but she is chatty."