The Prince and Princess of Wales's youngest child, Prince Louis, will celebrate his fifth birthday on Sunday 23 April.
The young royal was born in 2018 at the Lindo Wing of St Mary's Hospital, just like his older siblings, Prince George and Princess Charlotte.
While we're yet to see Louis make his royal tour debut, the Prince has passed some incredible milestones.
HELLO! takes a look at Louis' most public moments to date…
Trooping the Colour
Louis stole the show at the 2019 ceremony with his enthusiastic waving and his adorable moment with then-Duchess of Cornwall.
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© GettyThe tot, who was 13 months old at the time, looked adorable in a blue and white outfit, previously worn by his father, Prince William, and his uncle, Prince Harry, when they were children.
First words in public
William and Kate's children delighted royal fans when they took part in a Q&A with natural historian and broadcaster, Sir David Attenborough, in 2020.
It was the first time we heard little Louis, then two, speak for the first time in public. See what he had to say…
First day at nursery
Prince Louis' first day at Willcocks Nursery in Kensington coincided with his third birthday, and mum Kate snapped a photograph of her little boy on his red balance bike to mark his milestone.
The smiling prince looked ready for his big day in a collared shirt, a navy jumper, blue shorts and a coordinating backpack.
Platinum Jubilee celebrations
Louis truly was the star of the show with his cheeky antics during the Platinum Jubilee celebrations last summer.
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© GettyThe royal joined his mother and siblings in the carriage procession at Trooping the Colour, and was spotted having a sweet moment with his grandfather, then-Prince Charles, during the pageant.
First day at school
© GettyIn September 2022, Louis joined George and Charlotte as they started at their new school, Lambrook, following their move to Adelaide Cottage in Windsor that summer.
Christmas Day debut
Louis joined his parents and siblings for the first time at the Christmas Day church service in Sandringham last year.
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© GettyAnd his bond with Charlotte was evident as he chased after his big sister with a big bunch of flowers, as the young royals joined their parents to speak with locals during a walkabout.
Easter Sunday church service
The Prince made his debut at the Easter Sunday church service in Windsor earlier this month.
© GettyThe Waleses coordinated in blue and navy shades, with Louis donning a blazer, shirt, blue shorts, long socks and a bicycle print tie.
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