10 Celebrities With Surprising Siblings: Demi Lovato, Scarlett Johansson, and More! (PHOTOS)
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Sammi Sweetheart's Sister: Nikki Giancola
Sammi Sweetheart's sister may not be a roommate in the Jersey Shore house, but she sure knows how to GTL. Sammi's brunette sis, Nikki, even has her own workout company called Fixx Me Fitness.
