Kate Middleton, the Duchess of Cambridge, turns 32 today. The mother of 5-month-old Prince George will be marking turning another year older with a low-key birthday celebration likely with close friends and family.

A spokesman for Kensington Palace told Us Weekly of her plans, "The Duchess of Cambridge is spending her birthday privately.”

Her husband, the Duke of Cambridge, will be busy attending classes at Cambridge University during the day, as part of his 10-week program in agricultural management, but he will be back at Kensington Palace in London later tonight to spend some time with his wife.

As we previously reported, the palace said going back to school will "help provide the Duke with an understanding of contemporary issues affecting agricultural business and rural communities in the United Kingdom."

Last year, Middleton was pregnant with Prince George on her birthday. She gave birth to the possible future King of England on July 22, 2013.

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