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Rosalie isn't called Rosalie Cullen, she's Rosalie Hale.
Rosalie Mary Cullen
Actually, it's Rosalie Lillian Hale. Rosalie is a Hale because she chose to keep her original last name.
Rosalie from the twilight saga's full name is Rosalie Lillian Hale.
Rosalie and Edward
Emmett married rosalie after rosalie saved him from a bear attack