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They both burst onto the scene in the '70s and 30 years later are spokespeople for two different weight loss giants. So with so much in common, why are Valerie Bertinelli and Marie Osmond facing off?

"That would not make me happy," Osmond says on Thursday's edition of Nightline" when talking about Valerie posing in a bikini for her new Jenny Craig commercial. "And I am not doing it, you know, I am not. I don't want to see a 49-year-old woman in a bikini. No."

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