Queen Elizabethis officially the British royal family’s longest-serving monarch.

The queen herself made an appearance after a long year of cancelling engagements due to illness and mobility issues.

Read on to see how the 4-year-old stole the show at the celebrations.

Prince Louis looking sulky with Kate Middleton and Princess Charlotte

His siblings wore complementary colors, with George in a navy suit and Charlotte in a powder blue dress.

But Prince Louis did not let viewers' attention remain on his outfit for too long.

His moods flooded the #princelouis hashtag onTikTok.

The Queen speaks to Prince Louis

Unconvinced, the little prince broke away from his mother and rushed towards his great-grandmother.

Queen Elizabeth also did her best to settle him.

Sullivan noted that she appeared to tell him to “look up at all that smoke.”

Prince Louis waving with his mouth open

The prince was entranced by the queen for a short while before he grew restless again.

That really was wonderful, so incredible," according to Sullivan.

ATwitteruser summed up the moment.

“Prince George, Princess Charlotte and Prince Louis are 3 different moods.

Louis is a big mood,” they wrote.

Anothertweetcompiled all the faces Louis made and called the resulting meme the “PRINCE LOUIS MOOD SCALE.”