Kelly Clarkson and Brandon Blackstock at the 55th Grammy Awards...

Kelly Clarkson and Brandon Blackstock at the 55th Grammy Awards at the Staples Center in Los Angeles. (Feb. 10, 2013) Credit: Getty Images

Singer Kelly Clarkson, the inaugural winner of "American Idol," is expecting a baby with new husband Brandon Blackstock.

"I'm pregnant!!!" she tweeted yesterday. "Brandon and I are so excited! Best early Christmas present ever :)" Clarkson, 31, already is stepmother to Blackstock's two children from a previous marriage, son Seth and daughter Savannah.

The singer and Blackstock -- a talent manager who is the son of Clarkson's own manager, Narvel Blackstock -- were married Oct. 20 in Tennessee, where they live.

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