Kate's little sister is also a fashion icon

Pippa Middleton stepped out in four different dresses yesterday to launch her new party planning guide Celebrate.

Kate‘s little sister, 29, made the outfit changes as she stopped off at several venues around London signing copies of the £25 book.

Pippa first wore a £395 Paper London patchwork frock to make a secret visit to Foyles Bookshop in the West End, where her hair hung loose around her shoulders.

She emerged at Chelsea’s Daunt Books in an £815 Roksanda Ilincic purple wool number with her locks scraped back into a Kate-esque pinned-back ‘do, which she kept for the rest of the day.

Shortly after, she donned a long-sleeved black and green £249 Markus Lupfer mini to throw a children’s Halloween party in the store.

Pippa showed off her pins at an evening signing in a high-necked £1,500 Stella McCartney dress and a pair of simple black courts.

Her brother James and parents Carole and Michael Middleton turned up at the final venue to show their support, but Kate, 30, couldn’t make it.

SEE PICTURES Prince Harry makes first public appearance after naked pictures scandal

SEE PICTURES Kate Middleton and Prince Harry enjoy London 2012 Closing Ceremony without Prince William

SEE PICTURES Kate Middleton cuddles Prince William with Prince Harry as Chris Hoy wins 5th Olympic gold

Anna Duff