Pippa Middleton is throwing a New Year's Eve bash for pals at her family's mansion.

The professional party planner hopes to show off her skills before publishing a book on being the perfect hostess, for which she got a $616,000 advance.

The bash will end an amazing year for Middleton, whose shapely bottom won fans when she was her sister Catherine's bridesmaid at Britain's royal wedding in April.

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"She's gone from being largely unknown to one of the most recognized women in the world, so she decided to hold a big party to thank everyone," a source said.

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Middleton, 28, booked out an entire hotel near her parents' home in Bucklebury, southern England, for the overspill.

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Meanwhile newlyweds Catherine and Prince William, both 29, are expected to spend the New Year quietly at Balmoral, in Scotland.