Kelly Clarkson expecting a baby girl

'American Idol' winner Kelly Clarkson is expecting a baby girl with husband Brandon Blackstock.

"We just found out we're having a girl officially! I knew it! Only a girl could cause this much drama with all this vomiting ha!," she posted on Twitter.

The 31-year-old pop vocalist, who got married last October, had announced her first pregnancy in November.

"I'm pregnant! Brandon and I are so excited!" she had written.