"Maria is a full-time nanny, who started work with us recently," said a Kensington Palace spokesperson.
"We will not be giving further details, except to say that the Duke and Duchess are delighted she has chosen to join them."
Maria was personally selected by the Duke and Duchess from a group of nannies put forward by Norland College - which has been known to produce "Mary Poppins meets 007" care givers - and started work at the Palace last month.
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