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Happy Birthday, Prince Louis! The Tot Is Growing Up So Fast — See His Cutest Photos

Kate Middleton and Prince William's youngest son, Prince Louis, is growing up so fast! See his cutest photos, here.

Happy birthday, Prince Louis! Prince William and Kate Middleton's youngest son turned three on Friday, April 23 — and he's getting so big. 

One day earlier, the couple — who also share Prince George, 7, and Princess Charlotte, 5 — shared a new photo of the tot via social media. 

"Three tomorrow! ?," Kensington Royal posted on their Instagram page on April 22. "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. ?."

Scroll through the gallery below to see more snapshots of the little royal!

"Prince Louis was born at 11.01am on 23rd April 2018 at St Mary's Hospital in Paddington, London, weighing 8lbs 7oz. As the third child of The Duke and Duchess of Cambridge he is fifth in line to the throne," a statement said at the time. 

A few months later, members of the royal family attended the Christening of Prince Louis at the Chapel Royal at St James Palace in London on July 9, 2018. 

Of course, Kate, 39, took this adorable photo of her youngest son at their home in Norfolk in April 2019. 

Waving to the crowd! Louis, who sported a white shirt with blue pants, made his mama smile when they attended the Trooping the Colour at Buckingham Palace in London on June 8, 2019. 

“Family means everything to the mom of three, and one of her biggest worries about the future is not being there for George, Charlotte, and Louis. George is well-behaved," an insider said of the tots. "All the kids are, but Charlotte and Louis both have a cheeky streak. Louis is more like Charlotte in personality than George!”

In honor of Louis' second birthday, the toddler celebrated his big day at Amner Hall in the U.K. Louis looked like he was having a great time as he finger painted. 

"Sharing a sneak peek of Prince Louis’ handiwork ahead of his second birthday! ?," Kensington Royal captioned the photos at the time. "The Duke and Duchess of Cambridge are pleased to share new images of Prince Louis, taken by The Duchess this April."

He's ready to go! "Three tomorrow! ?," Kensington Royal wrote on Instagram. "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. ?."