They're some of the most photographed people in the world - yet would you recognise a European royal from their childhood photo?
This weekend, an Instagram fan account in honour of Prince Albert II of Monaco shared a throwback snap of the 64-year-old.
Delighting royal enthusiasts, the image showed a young Prince Albert, aged four at the time, waving at the camera while dressed in a sailor's hat and cream knitted jumper.
His older sister Princess Caroline and his mother, the late American actress and princess, Grace Kelly, are pictured behind him in the 1962 photo.
'He was and is the same… such a beautiful photo! Love it! Thank you for sharing it,' commented one enthusiastic follower.
But while fans could easily recognise the prince in his childhood snap, are other European royals just as distinguishable in their younger years?
Here, FEMAIL puts your royal knowledge to the test as we show princes and princesses in their childhood photos. Scroll further down to see which image belongs to which royal.
This royal has competed in a staggering five Winter Olympics as part of his country's national bobsleigh team from 1988 to 2002
A modern monarch, who is now all grown up, this royal is married to a TV news journalist, and the couple share two daughters
This princess is now famously married to a man who used to be her personal trainer, with the couple sharing two children
This young woman grew up to be the Queen of her country, and marks her Golden Jubilee this year
This puppy-loving royal is said to be friends with Queen Elizabeth II - reportedly once gifting her a horse
Don't let the pretty pink frock fool you - this royal is a tough cookie, and underwent full training at her country's Royal Military School
This youngster, who is heir to a European throne, is currently studying at a college in Wales
This member of European royalty shares something in common with a member of Hollywood royalty - he has the same birthday as Leonardo DiCaprio
Snapped in 1968, this young prince became King and married a woman known for her colourful and vibrant outfits
1. Prince Albert of Monaco
2. King Felipe VI of Spain
3. Crown Princess Victoria of Sweden
4. Queen Margrethe II of Denmark
5. Princess Beatrix of the Netherlands
6. Princess Elisabeth of Belgium
7. Crown Princess Leonor of Spain
8. Prince Guillaume, Hereditary Grand Duke of Luxembourg
9. King Willem-Alexander of the Netherlands