Prince Louis birthday picture: Kate Middleton youngest 'just like mum' in sweet new photo

The expert said: “Louis has always looked like such a happy, active, chatty and fun-loving baby and toddler and here in his third birthday portrait he is showing that nothing has changed.

“With his very Middleton features he seems to have inherited a spirit and an exuberant confidence that this photo captures perfectly.”

The new portrait “catches Louis mid-adventure”, Judi claimed.

She said: “Instead of a static pose, Louis looks as though he has been caught mid-adventure, with his trainers, backpack and bright red bike.”