London: Pippa Middleton was banned from an event  last week.

The sister of Kate Middleton was left out in the cold as the bash was to celebrate the release of a book poking fun at her Celebrate party planning tome.

Sources say Pippa, 29, was surprised by the snub. “We didn’t invite Pippa because we thought it might be a bit weird,” said Mat Morrisroe, co-author of When One Is Expecting. “She has been sent a copy of the book, though. She’s happy to poke fun at herself.”–GN