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While Victoria Beckham said she doesn't know the sex of her fourth child on Tuesday's Late Night with Jimmy Fallon, the pregnant mother of three boys hinted she and hubby David Beckham would like to add a girl to their brood.

"We have so much testosterone in our house, it is crazy," said the mother of Brooklyn, 11, Romeo, 8, and Cruz, 5.

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But the 36-year-old designer noted the upside of having another male in the family. "We will have half of a five-aside football team if you add in David!"

In a forthcoming issue of Vogue, Beckham jokes about the possibility of a little lady joining the crew, saying, "At this stage, I think the chances of having a girl are quite slim."