Pippa (left) and Kate Middleton
Richard Young/REX USA
It's traditional to keep the bride guessing when it comes to her bachelorette party. In Kate Middleton
's case, sister Pippa has to keep the world guessing as well.
Pippa, 27, who's in charge of planning the "hen party" for Kate, 29, is actually preparing two celebrations – one somewhere in London and one at the Middleton family home in Bucklebury, Berkshire, reports Britain's Daily Mail
Pippa has reportedly booked four venues in London and is keeping even the attendees in the dark about which is the real one. "None of the girls know where they will be going – and won't until the actual day," a source tells the paper.
Meanwhile, the soirée in Bucklebury, which Kate and Pippa's mother Carole will attend, is expected to have a Dirty Dancing
Pippa, who is Kate's only sister, will be her maid of honor at Kate's April 29 wedding
to Prince William
. It's still unclear whether Pippa will be Kate's lady-in-waiting
after the nuptials.