Kelly Clarkson is pregnant!

Pop star Kelly Clarkson is expecting her first child with husband Brandon Blackstock!

The 31-year-old Tie the Knot singer took to Twitter on Tuesday to share the exciting news.

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She tweeted: "I’m pregnant!!! Brandon and I are so excited! Best early Christmas present ever."

Although it's still too early to know the sex of her baby, Clarkson predicts the baby will be a girl.

Kelly Clarkson and Brandon Blackstock at the Grammy awards in February. Source: Getty

She told Parade magazine: "I'm totally gonna have a girl. I'm manifesting it! And when I have a girl, you're gonna be like, 'That chick knew it!'"

Clarkson's pregnancy comes just weeks after she married Blackstock in Tennessee.

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Her husband is already father to two children, Savannah, 12, and Seth, 6, from a previous relationship, and the couple couldn't wait to expand their family.

Clarkson said on The Tonight Show recently:

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"We are not announcing anything right now! We’re not, no.

"Practice makes perfect! We’re trying, trying, trying…like rabbits!"