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Victoria Beckham may want to wait awhile before painting her nursery.

The 36-year-old fashion designer -- who's currently expecting baby No. 4 with soccer superstar David Beckham -- admits her unborn child's gender remains a mystery.

"I can go on the record and say contrary to rumors, I do not know the sex of my baby!" she tells USA Today.

The former Spice Girl revealed she may not find out if she's carrying a boy or a girl until she goes into labor, as she and David, 35, just "feel so lucky and so blessed" to be expanding the Beckham brood.

Though a girl would be a welcome change -- she and David are parents to sons Brooklyn, 11, Romeo, 8, and Cruz, 6 -- Victoria admits there's a certain familiarity with running a male-dominated household.

"We know what to do with boys," she says. "They're excited about having a little brother to teach how to play soccer. But, if it's a girl, we'd be over the moon as well."

In the meantime, the fashion designer -- who's due this summer -- says she's focused on promoting her fall collection, which she recently debuted during a private presentation on New York's Upper East Side.

"I can't wait to fit in [the dresses] again," she said while narrating the show. "I designed this collection before I found out I was pregnant."

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