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Despite the pictures of Kate out partying, she handled herself "brilliantly" according to former BBC royal correspondent Jennie Bond. "There was never a more important time for Action on Addiction to succeed".
For the event, Catherine looked classy in an incredible white Barbara Casasola dress.
Turning to Kate, he added: "She wanted to know if you'd be wearing your Princess Elsa dress".
Ahead of the gala dinner on Wednesday evening, Kate met with clients of Action on Addiction helping to prepare and serve the evening meal under Spring's Michelin-star winning chef Skye Gyngell.
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The Duchess will give some opening remarks at the event to recognise the work done by the charity, and talk about how her time as Patron has also inspired other elements of her work.
He said: "She's got a really naughty sense of humour, which really helps me because I've got a really dirty sense of humour so it was good fun, we had a really good laugh, and then things happened".
I'm hugely passionate about the support it provides, especially for parents, children and families who suffer from, or through, addiction.
The royal has been snapped in the glittering silver shoes before too, and was last spotted in the shimmering pumps as she attended the BAFTA awards in February of this year.
Action on Addiction helps both individuals and families affected by drugs and alcohol in various ways - from developing top quality, and the most effective, residential and community-based addiction treatment services to promoting self-help and peer-to-peer support.
Whether you're looking to channel your inner Cinderella or Kate Middleton, we think glitter heels are a must, with or without the royal price tag. "It also lends direct support to the children and families affected by addiction, for as long as it takes".