Socialite Paris Hilton is adamant the sex of pal Nicole Richie's baby is unknown - despite guests buying boy-themed gifts for her baby shower on Sunday (18Nov07). One guest at the party sparked rumours the star was expecting a boy after she presented the 26-year-old with sneakers and a maternity T-shirt emblazoned with a picture of a boy on the front. But Hilton, who co-hosted the event with friend Masha Gordon, insists first time mother-to-be Richie doesn't even know the sex of the child, and wants it to be a surprise. She says, "I (didn't) know what to get her. Because most of us don't know yet what she's having. She doesn't know if she's having a boy or a girl. I thought for sure she'd want to know, but she decided to wait." Speaking before the baby shower, Hilton admitted her first time hosting such an event was a daunting prospect: "I honestly don't know what you play at a shower. Maybe I'll find a book or something to get some ideas."