Prince Louis grins in adorable birthday portrait as royal turns 8

Prince Louis is 8!

Kate Middleton and Prince William celebrated their youngest child’s birthday by posting a new portrait via Instagram.

The little one was all smiles on a boat in the sweet snap, posing with his arms crossed in a blue half-zip pullover.

“Happy birthday, Louis!” the couple captioned Thursday’s social media upload. “8 today! 🎈”

While Middleton, 44, is frequently behind the camera for her kids‘ birthday snaps, she tagged Matt Porteous as this year’s photographer.

The Princess of Wales and her husband, 43, are also the parents of son Prince George, 12, and daughter Princess Charlotte, 10.

The couple have been married since April 2011.

On Thursday, King Charles’ Instagram account re-posted Louis’ portrait via Stories.

“Happy birthday to Prince Louis!” the monarch, 77, wrote.

Louis has a reputation for being the cheekiest mini royal, often making headlines for his antics at public events.

Most recently, the little one stole the show during his family’s Christmas walk at Sandringham in December 2025.

Louis, notably, snatched a massive Lindt chocolate from his dad’s hands, which made William laugh.

In May 2023, Louis was photographed yawning at Charles’ coronation.

During Queen Elizabeth II’s Platinum Jubilee the previous year, he hilariously covered his ears and yelled during the flypast.

William and Middleton poked fun at Louis at the time, telling their Instagram followers they “all had an incredible time, especially Louis… 👀.”