The bash was low-key compared to Bea’s infamous 18th party at Windsor Castle in 2006 when 400 revellers, dressed for a Victoriantheme masked ball, got through $700,000 of booze and canapes.
A royal insider told The Sun: ‘Beatrice invited close friends as well and they stayed in lodges on the estate which are rented out to the public at other times of the year.’
‘It was a fantastic experience for Bea’s friends to sleep on the estate, but of course meeting the Queen was the icing on the cake.
‘It was a fantastic night and after the Queen had retired Bea and her friends were able to enjoy a few drinks into the early hours, but the most wonderful thing was the Queen was there.’
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