While Prince William and Kate Middleton's kids had a lot of adorable moments during King Charles III's coronation, it may have been Prince Louis' candid reactions that took the crown.

Like when the 5-year-old was spotted letting out a big yawn during the May 6 ceremony at Westminster Abbey in London. Or, when he was seen looking towards the ceiling, gazing up at his mom and pointing something out to his 8-year-old sister Princess Charlotte.

And followers couldn't get enough. "Prince Louis: Meme King," one social media user tweeted about Louis, who previously gave fans a giggle at the Platinum Jubilee celebration for the late Queen Elizabeth II last June. "#Yawn." Added another, "Spotlight of the show." 

To be fair, the two-hour service was a lot for the young royal to sit through, and fans seemed to understand.

"Bless him," one tweeted. "It's so hard for a 5year old to sit still!" Wrote another, "He's doing very well. Cutie pie."

And at one point, Louis—who was also part of the procession into the church where he sweetly held Charlotte's hand—took a short break. As ITV royal editor Chris Ship tweeted, "At age 5, we are told he will be seated and then 'retire' for a while during the 2 hour service."

Still, Louis was back in time to watch the newly crowned King Charles III and Queen Camilla take part in the procession out of the church, with him singing "God Save The King" before joining them along with his fellow family members. They then rode off in carriages to Buckingham Palace.

Days before the event, Kate had been asked whether she thought Louis would behave at the historic occasion.

"Yeah, I hope so," she said in a video shared by TikTok user @catherinegulgapar. "You never quite know." 

To see more of Louis, Charlotte and brother Prince George's precious moments from the big day, scroll on.

Prince George served as one of the eight Pages of Honour for grandfather King Charles III's coronation on May 6.

Prince Louis and Princess Charlotte held hands at the crowning ceremony.

Kate Middleton and Prince William accompanied their kids inside the Westminster Abbey in London.

Louis pointed something out to his younger sister at the church.

In true Lous fashion, the prince made one of his silly faces while riding in the family carriage.

Kate and William's youngest child was a total mood on this rainy London day.

George stuck his tongue out while standing in line with his fellow pages.

Louis adorably tried to get his mom's attention.

Charlotte sat close to Kate.

Charlotte and Louis looked out from the windows of their carriage as they rode to Westminster Abbey.

Inside the arriage, Louis yawned as his older brother George scratched his nose.

The family sat in the front row.

Charlotte and Louis followed their mom and dad in the procession. 

For the occasion, Charlotte wore an outfit designed by Alexander McQueen.

Louis let out a small yan during the ceremony.

Despite being known for his cheekiness, Louis was largely on his best behavior.

George took his duties as a Page of Honour very seriously. 

Little Louis looked dapper in a navy blue ensemble.

Charlotte rocked a silver bullion and crystal flower crown similar to Kate's Alexander McQueen headpiece.

Louis and Kate shared a sweet moment together during a break in the ceremony.

Kate escorted Charlotte and Louis out of Westminster Abbey following the coronation.

The siblings sat in a carriage behind their grandparents' Gold State Coach.

Louis flashed a smile from the cart.