Kate Middleton catches Prince William giggling in Westminster Abbey

On Tuesday morning, the Royal Family celebrated the 100th anniversary of the Royal Air Force. The formal event was held at Westminster Abbey.

According to an Instagram video, Prince William was caught being naughty as he giggled during the service. His wife, Duchess Kate, spotted him mid-laugh preventing him from bursting out with laughter.

As Prince William sat next to Duchess Kate at the Cathedral something appeared to make him giggle as he was seen holding in a laugh in the middle of the ceremony. However, before he could let go and laugh freely, Kate turned and looked at him.

This prompted an awkward moment for the Prince as he seemed to be explaining to his wife what he’d found funny. It's not clear what William was giggling at exactly, but as he explained, his wife appeared to crack a smile too

For more on this story go to our Twitter account @amomama_usa. The moment was a sweet one between the two as they refrain from public displays of affection.

For the occasion, Prince William was dressed in uniform and Kate wore an Alexander McQueen coat dress. Prince Harry and Duchess Meghan also made it to the event.

The Duke and Duchess of Cambridge had just celebrated the christening of their youngest child, Prince Louis, at St. James' Palace the previous day. That occasion brought together family members like Pippa and James Middleton, Prince Harry, Meghan, and Prince Charles and his wife Camilla.

It was the first time that the Cambridge family were photographed with all three of their children which included Prince George and Princess Charlotte. The last time William was seen at Westminster Abbey, he appeared to have trouble staying awake.

In late April, during the Anzac Services, the Prince was spotted with his eyes closed. It was two days after he and Kate welcomed baby Louis.

For that event, Kate stayed at home and William attended the service looking a bit sleep deprived.