Kate Middleton's sister Pippa has launched her first book, titled Celebrate: A Year of British Festivities for Families and Friends.

The 29-year-old debuted the glossy hardback at a children's Halloween party in London.

She treated the kids to cakes and activities from her party book and also helped with some of the crafts.

It has been widely reported that Pippa has been paid around £400,000 by publisher Penguin for the 416-page book, although this has not been confirmed.

As well as containing recipes and ideas for entertaining guests at parties, the hardback also shows numerous photographs of Pippa and addresses issues such as her famous behind and royal brother-in-law.

Celebrate is now available to buy in the UK.