Kelly Clarkson tweets she's having a girl

Kelly Clarkson at The 47th CMA Awards at

Kelly Clarkson at The 47th CMA Awards at Bridgestone Arena in Nashville, Tenn. (Nov. 6, 2013) Photo Credit: AP

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Kelly Clarkson, who announced in November she and husband Brandon Blackstock were expecting, tweeted Monday that they are having a girl.

"We just found out we're having a girl officially!" the inaugural winner of "American Idol" wrote. "I knew it! Only a girl could cause this much drama with all this vomiting ha!" Clarkson, 31, already is stepmother to Blackstock's two children from a previous marriage. The singer and Blackstock were married Oct. 20.

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