Royal sister-in-law Pippa Middleton has secured a nearly $600,000 advance to write a party planning book, according to the Mail on Sunday.

 

An auction for the socialite’s project had reportedly been going on for weeks, with publisher Michael Joseph, an imprint of Penguin, coming out on top.

 

“It will be about entertaining and how to throw the perfect party,” a source says.

 

“It’s not just about being the perfect hostess — it will also include recipes and information about how to host different types of events.”

 

The book, which Middleton is reportedly writing without the help of a ghostwriter, is due out in time for the 2012 holiday season.