During their dating phase, Prince William and Kate Middleton briefly split up in 2007.

William and Harry can be seen introducing acts in a rediscovered tape from a Princess Diana tribute concert in 2007.

Judi James' analysis revealed William's awkward dad-dancing and Harry's expressionless reaction.

While William encourages Harry to join in, he appears to be talking to his fiancée, Chelsy.

Kate was seated several rows back, most likely as a result of the break-up.

Chelsy was the first to notice William's attention-seeking dance, which she immediately reported to Harry.

Harry's reaction was that of a teenager whose father was humiliating them at a party.

William appeared to be gloating to Kate about his independence and enjoyment without her, but he wasn't equipped for this kind of body language ritual.

This was most likely a small swan song before marrying Kate.