And there was only one designer Kate was ever going to turn to for the high-profile event:William is president of Bafta, and the couple rushed to be there from a polo game triumph in Santa Barbara earlier in the day.
Other stars to attend the bash included Jennifer Lopez, striking in an emerald cut-out gown, Jennifer Garner, who opted for royal blue, Gordon Ramsay, Jack Black, Blake Lively, Tom Hanks and more.
Nicole Kidman, who dazzled in an ice-blue sequin-covered gown, said of the royal couple: 'I think they are lovely, they just make you smile.'
See all the pics from the A-list bash below:
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