Prince Louis
Prince Louis' adorable smile in this photo with mom, Kate Middleton, won royal fans' hearts. Pictured: Middleton carries Prince Louis as they arrive for his christening service at St James's Palace on July 09, 2018 in London. Getty Images/Dominic Lipiniski

Prince Louis is as adorable as his siblings, according to royal fans.

On Monday, Kensington Palace released Prince Louis' christening photos. And one snap featuring Kate Middleton with the baby in her arms showing off a big smile won the hearts of royal fans on Instagram. In the picture, the Duchess of Cambridge can be seen smiling as Prince Louis opened his mouth widely as if he saw something that amazed him.

The beautiful photo of the mother and son didn't go unnoticed among fans who have been following the Cambridges. The majority agree that it was a lovely shot.

"The Duke and Duchess of Cambridge have released an additional photograph taken following the christening of Prince Louis," the palace wrote in the caption. "The Duke and Duchess hope that everyone enjoys this lovely photograph of Prince Louis as much as they do."

"Awwwww too cute," opeyemisdiary wrote in the comment section.

"He is beautiful. Congratulations Kate and Will," d_pears87 agreed.

"Oh my goodness this is precious! Beautiful photo!" mammotaps wrote.

"Magnificent," jeffrey_alan_greischel commented.

"Such natural joy from adorable Prince Louis!!" instaelainem wrote.

"He is absolutely just as handsome as his daddy and big brother! Kate is so beautiful and Charlotte is going to take after her without it out," user proudsoutherngirl commented.

"Adorable little one!" sweatneatcrafts wrote.

Meanwhile, one user wondered where Prince Louis was looking at and why he appeared to be so excited. "And I'm curious where Prince Louis' is looking at that makes him so excited," bedofroses1990 wrote.

Another fan also noticed Prince Louis' resemblance to his big brother, Prince George. "Awww so gorgeous. Louis looks like mini George," Daily Mail noted.

Prince Louis' christening was held on July 9 at the Royal Chapel at St. James's Palace, London. The Duke and Duchess of Cambridge opted to choose the same church where Meghan Markle was baptized. They also selected the Archbishop of Canterbury, the Most Reverend Justin Welby to conduct the service. Welby officiated the Duke and Duchess of Sussex's royal wedding in May.

Earlier royal expert James Brookes suggested that Prince William and Middleton would compromise for the said event. The royal couple would keep Prince Louis' christening a private affair but would still share photos to the public and it seemed to be the case.