Britain's Prince William, the Duke of Cambridge, and his wife Kate, Duchess of Cambridge arrive at a charity event for Absolute Return for Kids in central London. (AP Photo/Alastair Grant)

Prince William and his new wife have attended their first official engagement as a married couple.

The Duke and Duchess of Cambridge, as the couple is officially known, were the guests of honour at a charity gala dinner on the grounds of Kensington Palace on Thursday evening (local time).

Guests clamoured to snap photos on their smartphones of the former Kate Middleton, who cut a glamorous figure in a dusty pink, sparkling Jenny Packham gown.

The benefit for the charity Absolute Return for Kids, also known as Ark, attracted a who's who of Britain's rich and famous.

Tickets for the black-tie event reportedly went for 10,000 pounds a head.

William and Kate were married in a lavish ceremony on April 29 at Westminster Abbey.