Her inner circle are planning a low-key 30th Birthday celebration on Monday.
But on the eve of the big day, the Duchess of Cambridge went all out at her first royal premiere in a sweeping floor-length cream gown embroidered with delicate black flowers.
Kate and Prince William were attending the premiere of Steven Spielberg's latest film, War Horse.
The event was supportting the foundation established in the name of the future King and his brother.
"This is so exciting. I get a buzz. You never grow out of something like this," director Steven said.
"It's an honour to be here with the royals. This is my first royal premiere for the Duke and Duchess, having done them before for the Queen and the Queen Mother".
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Photo: © Rex