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

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"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.