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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.



Later in the show, after Letterman had Spears read the Top 10 List, he asked again: " So we¿ve established now that you are, in fact, pregnant?"



Spears responded, " Yes, sir."



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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."