Singer Kelly Clarkson pregnant with first child

Kelly Clarkson performs at the annual shareholders meeting for Walmart in Fayetteville, Arkansas
Singer Kelly Clarkson performs at the annual shareholders meeting for Walmart in Fayetteville, Arkansas June 7, 2013. REUTERS/Rick Wilking

LOS ANGELES (Reuters) - Pop singer Kelly Clarkson is pregnant with her first child, the 31-year-old Grammy winner announced on Twitter on Tuesday.

"I'm pregnant!!! Brandon and I are so excited! Best early Christmas present ever :)," Clarkson tweeted.

Clarkson, the first contestant to win the Fox singing competition "American Idol," married talent manager Brandon Blackstock in October.

The Texas-born singer is one of the most successful winners of the show, having crossed over from country to pop music with hits such as "Since U Been Gone" and "Stronger (What Doesn't Kill You)."

Clarkson is the stepmother to Blackstock's two children from a prior marriage.

(Reporting by Eric Kelsey; Editing by Mary Milliken and Mohammad Zargham)