Clarkson has announced, rather spontaneously, that she's expecting her second child with husband Brandon Blackstock. (RCA Records)

Clarkson has announced, rather spontaneously, that she's expecting her second child with husband Brandon Blackstock. (RCA Records)

Burleson-rooted pop powerhouse Kelly Clarkson gave a Staples Center crowd an unexpected emotional thrill last night, suddenly dropping the knowledge that she's pregnant with her second child.

According to a TMZ report that included the fan video below, the big moment came during the song "Piece by Piece" when the singer got a little choked up. After a pause, the always bluntly honest Clarkson let the words fall out:

"I'm just not planning on announcing this but ... I'm totally pregnant.

"I'm having a really hard time ... I'm totally gonna nail the [expletive] out of this song, give me a second."

Clarkson and husband Brandon Blackstock welcomed their first baby, daughter River Rose, last year. No word on when the new bundle o' joy is expected, but deepest congratulations go out to the happy couple (and her pumped-up fans).

The Staples show also brought an of-the-moment cover song via Clarkson — she tackled Demi Lovato's hit "Cool for the Summer" to the delight of her fellow North Texan.

Kelly Clarkson / Pentatonix / Eric Hutchinson

Clarkson's joint tour with Arlington pop phenom Pentatonix arrives at Gexa Energy Pavilion on Aug. 30. We're hoping she's saved something special for us, whether it's a cover song or another life-altering announcement. If not, we'll just be glad to hear that voice again.

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