Are Beyonce and Jay-Z having a girl?

Singer Beyonce Knowles performs onstage during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California.
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Beyonce announces pregnancy at VMAs
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(CBS) Kelly Rowland may have accidentally spilled the beans about the gender of Beyonce and Jay-Z's baby.

The high-powered music couple haven't revealed whether they're having a girl or a boy, but Rowland slipped during an interview this week with Us Weekly.

Pictures: Celebrity baby bumps
Pictures: Beyonce

While chatting with the magazine at the Cosmopolitan Awards in London Thursday night, Rowland used the words "her" and "she" while talking about the pair's unborn baby.

When asked what gift she'll bring to the baby shower, Rowland said, "I don't know," adding, "I think her dad [Jay-Z] is gonna give her everything anyways, all I can give her is love."

"I think she'll be very well behaved," Rowland said about the baby. "Her parents will make sure of that."

Beyonce is due in February.