Kate Middleton is turning 33 on Friday, which is cause for a royal celebration.

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While the public might choose to celebrate on their own, People reported on Thursday that the princess will be spending a quiet day with her husband, 32-year-old Prince William, and their one-year-old son, George.

The family is expected to stay at Amner Hall, where they recently celebrated Christmas on Dec. 25 with Kate's parents, brother and sister.

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It looks like this will be Princess Kate's most relaxed birthday to date considering the plans she'd made for it in previous years.

When the princess turned 31 in 2013 she and William hit the town with a few of their friends. For Kate's 32nd birthday last year she celebrated in London.

As the mother of a one-year-old who is also pregnant with her second child, it's no wonder Kate would want to have a quiet weekend. It will also give her a chance to relax before entering a busy stretch of royal duties.

Starting Jan. 15 she is expected to resume public appearances, naming The Clore Art Room at Barlby Primary School in London and then a charity event the following day.

On Jan. 19 Kate will continue with her London engagements, visiting Kensington and then going on to attend the opening of a new school. During this time Prince William will resume his studies.

Princess Kate is expected to give birth to her and Prince William's second child in April.