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Britney Spears and husband Kevin Federline are expecting their second child together, Spears told David Letterman during a surprise visit to his show on Tuesday.
"Don't worry, Dave, it's not yours," the singer joked.
"Oh. Well, I think that's good news for both of us," Letterman responded, according to a show transcript.
Spears's announcement, first reported by Access Hollywood, was confirmed by her rep.
Spears, 24, and Federline, 28, already have a son, Sean Preston, who was born in September of last year. The pop star, who has been on an extended hiatus for nearly two years, calls motherhood "such an intense experience."
Spears wed Federline in September 2004, and the pair began talking about starting a family soon after. "I can see myself as a mom. Next year at 23, I am so there," she told PEOPLE shortly after the wedding. Just four days short of the couple's first wedding anniversary, she had accomplished that goal.
As for her career, Spears told PEOPLE in February, "I'm going to (get back to work), but I'm going to do it with definite balance for my baby because I want him to have the best of both worlds."
Spears, who lives with Federline and "Sean P" in their newly remodeled home in Malibu, recently returned to the spotlight by making a guest appearance on Will & Grace.
Meanwhile, Federline is following in his wife's footsteps: His debut album Playing with Fire is scheduled for release in August.
Of her domestic life out of the spotlight, Spears added: "I'm happy. I'm very blessed. I have a beautiful home, a wonderful family, supportive, loving people around me. I have a great life.