A glimpse of Kate celebrating the Queen's 90th Birthday

Queen Elizabeth II celebrated her 90th birthday today. Her Majesty spent the day at Windsor Castle were she was greeted by huge cheering crowds.

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In the evening, Prince Charles hosted a private birthday dinner for his mother. More than 30 members of the Royal Family were among the 71 guests attending the formal dinner, including the Duke and Duchess of Cambridge and Prince Harry.

IKON Pictures shared this image on Twitter of the royal trio leaving Kensington Palace en route to Windsor Castle.

From the limited photo it looks like Kate is wearing a new green lace dress. The What Kate Wore community have suggested it may be by Temperley London because the lace details look very similar to the designer's 'Amoret' gown.

Here's a closer look at the lace detail of the new dress compared to the 'Amoret' gown.

I'll update the post if anymore photos emerge.