The 29-year-old country singer spotted 12-year-old Chase's "Will you be my first kiss?" sign in the audience of her Louisville, Ky. show and called him up on stage.
"He's got the jump on me. I was 14 when I had my very first kiss. Just so you know my husband [Mike Fisher] is somewhere in this building backstage, so he may be looking for you later," Underwood warned him. "How are we going to do this?"
"Lip to lip," Chase boldly said.