The young royal was pictured on his Tadpole+ bike in a special shot taken to commemorate his third birthday. The photograph, uploaded to the Duke and Duchess of Cambridge’s Instagram account gathered more than 1.5 million likes.
After the snap was shared with millions of royal fans across the world, Ascot-based Frog Bikes reported it had sold out of the balance bike Louis is seen on.
The company’s spokeswoman Val Benyon said: “We’re delighted to see Louis on one of our bikes.
“It’s great to see a British brand being pushed by the royals.”
Prince Louis’ birthday post sparked an outpouring of well-wishes from royal fans who described Prince William’s son as “adorable”.
The message accompanying a photograph of the royal smiling read: “Three tomorrow!
“Taken earlier this week by The Duchess before he left for his first day of nursery, The Duke and Duchess are pleased to share a new image of Prince Louis.”
One Instagram user commented: “Oh my goodness he is absolutely adorable.
“Just like his big brother and sister.”
Another royal fan added: “Oh my he’s grown so much! Happy birthday!”