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Kelly Clarkson, Pregnancy, Baby Bump, Instagram

Instagram

Kelly Clarkson is pumped for her return to American Idol, and it seems someone else is as well.

The 33-year-old pop star and the reality series' first winner is set to perform and serve as a guest judge Thursday at the first live show of the 15th and final season. Clarkson, who is in the third trimester of her pregnancy, posted on her Instagram page that day a photo showing her grinning and holding a cut-out reading the hashtag "#idol" with one hand, while the placing the other near her baby bump. The singer looks adorable in a black, long sleeve maternity dress.

"I'm baaaack!!! See y'all tonight! #KellyOnIdol," she wrote. 

Clarkson revealed last August she is pregnant with her second child with husband Brandon Blackstock, 39. She said in October they are expecting a boy. The two also share daughter River Rose Blackstock, 1, while he also has a son and daughter from a previous relationship.

Thursday's episode of American Idol will mark Clarkson's 12th appearance on the show since she won season one. She and season four champion Carrie Underwood, who are both Grammy winners, are the show's most successful and popular alumni.