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Prince William struggled to contain his giggles at the start of the RAF Centenary service today - as a cool Kate managed to keep her composure.
The Duke of Cambridge, 36, was seen laughing after Prince Edward gestured at someone to kneel down at Westminster Abbey.
Camera - Smirking - William - Laughter
The camera then cut back to a smirking William, who was still trying to hold in his laughter.
The Duchess of Cambridge, 36, is then seen catching him giggling, with the pair exchanging a smile.
William - Service - Watch
William then appears to tell her when the service is expected to start, gesturing to his watch.
Lip-reading expert Joanne Swinbourne told FEMAIL that Edward, 54, appeared to be gesturing at someone opposite to kneel down.
'Edward - Someone
She explained: 'Edward says to someone opposite, “You can kneel if you want, kneel“ gesturing to them to kneel.'
Both William and Kate can seen be laughing at his remarks, before the camera cuts away to Prince Harry and Meghan.
Camera - Couple - William
However, when the camera returns to the couple, William is seen struggling to contain his...
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