The 'Batman Begins' actress - who has a five-month-old daughter, Suri, with fiancé Tom Cruise - is said to have revealed her baby plans to close friend Victoria Beckham during their Paris holiday.
A source told Britain's Daily Star newspaper: "Katie has three sisters so she really wants Suri to have the same sibling bond she enjoyed."
Katie and Victoria - who has three sons with her soccer star husband David Beckham - apparently swapped baby tips on the trip and Katie is even said to have advised the former Spice Girl on the best ways to conceive a girl.
The source added: "Katie was recommended to read 'Gender Giver' by a friend who swears by its theories. The book suggests surrounding yourself with female imagery and one of its top tips is to visit a burlesque show and applaud the female form. She showed the book to Victoria."
Katie and Victoria were clearly determined to follow the book's advice and were reportedly later spotted in Pigalle Place in Paris' sex district, enjoying a show.
I'm not sure I can handle another 9 (or was 11) months of pregnancy/fake/alien/dead-Hubbard-spirit speculation.