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"The Biggest Loser" is all about shedding pounds, but this season, host Alison Sweeney will be gaining -- and she broke the news while filming a session for the upcoming season of the series, "The Biggest Loser: Families."

ET has a first look at the emotional moment when a tearful Ali, who also stars as Sami Brady on "Days of our Lives," told the trainers and contestants, "I'm going to have a baby."

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