The smiling pair – who had recently reunited after Prince William was called away on a dramatic rescue mission in Anglesey – were joined by the Duke and Duchess of Cornwall, and the Queen herself at the event.
Working the room to meet many of the 350 attendees, the royals chatted to a host of photographers and journalists – including Fearne Cotton, Chris Evans and Marie Claire’s very own Editor-In-Chief Trish Halpin - ahead of the Queen’s diamond jubilee celebrations next year.
Proving her fashion credentials once again, Kate Middleton stole the style spotlight in a £1,400 emerald green Mulberry shirtdress.
With a chic Peter Pan collar, pleats and a super-luxe Peace & Love Jaquard pattern, the dazzling dress is still available to buy on the designer’s website today.
But we guarantee it won’t be around for long…
Love Kate’s beautiful green dress? Let us know in the comments box below.