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Kelly Clarkson Reveals the Sex of Her Baby

The "American Idol" winner announced the happy news on Twitter.

Kelly Clarkson publicity 2013 P
Jeremy Cowart

Break out the pink onesies! Kelly Clarkson and Brandon Blackstock are having a girl.

The American Idol season one winner took to Twitter on Monday to announce the happy news to her fans. 

"We just found out we're having a girl officially! I knew it! Only a girl could cause this much drama with all this vomiting ha!" she tweeted.

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Clarkson, who is four months along with her pregnancy, has been posting frequent updates on her condition since she announced the news she was expecting in November.

"I'm pregnant!!!" tweeted the 31-year old singer. "Brandon and I are so excited! Best early Christmas present ever :)"

Clarkson is up for a Grammy Award this Sunday for her collaboration with Vince Gill on “Don’t Rush” in the category of Best Country Duo/Group Performance.

Twitter: @MicheleAmabile