Pregnant pop star Kelly Clarkson called in to 103.7 KVIL's Leigh Ann & Courtney Uncorked radio show Wednesday and slipped up when talking about her second pregnancy, Entertainment Tonight reported. Clarkson's slip had fans speculating that the "Piece By Piece" singer is carrying twins.

Radio hosts Leigh Ann and Courtney Kerr talked with Clarkson about her marriage, her new song and her "Game of Thrones"-inspired family Christmas card during the interview, according to the recorded version of the interview on KVIL's site. Before wrapping up, they invited the American Idol alum to visit them next time for an in-studio interview so they could talk over a glass of wine.

"I'm gonna be everywhere once I get these kids popped out and done," the 33-year-old singer said. When the hosts pressed her about the possibility of carrying twins, she said, "That's why I look all..." before trailing off.

A rep for Clarkson confirmed that she is not expecting twins, E! News reported. However, Clarkson did reveal that she's expecting a baby boy in October in a post on her Instagram page, and she opened up about the health issues she's facing during her second pregnancy.

"I have this thing, like one percent of women get, it's called hyperemesis," Clarkson told the hosts. "It's horrible, it's like the darkest places I've ever been in my life."

Clarkson is already a mom to 18-month-old daughter River Rose, whom she shares with her husband Brandon Blackstock, as previously reported by HNGN.

See Clarkson's gender reveal Instagram post below.

 In other news, River's gonna have a little baby brother :) #itsaboy We're so excited!

A photo posted by Kelly Clarkson (@kellyclarkson) on Oct 23, 2015 at 8:59am PDT