Rosalie was gang-raped and left for dead by her fiancé Royce, Carlisle eventually found her and turned her into a vampire in order to save her life. She is the mate of Emmett.
Rosalie Lillian Hale was born in New York in 1915. Hailing from a wealthy family who took pride in their daughters beautiful appearance, Rosalie grew vain and shallow as a result. She eventually met Royce King II, a banker who proposed to the beautiful Rose. While walking down the street, Rosalie approached her drunken fiance and his friends. The night ended in her being gang-raped and near to death in an alley until Carlisle found her and transformed her into a vampire. She used her newfound abilities to hunt and kill down each and every one of Royce's friends; saving him until the very last.
She has a very cold, harsh personality which is as a result of her narcissism and rebellion against her vampiric life. Although in times of crisis, Rosalie is fiercely loyal and will stand by her family. She has a bitterness towards Bella, because of her quickness to abandon her human life and become a vampire, a choice Rosalie never had. Rose is deeply in love with Emmett and strongly desires to be a mother.
Rosalie has been said to be the "most beautiful person in the world" for any human or vampire. Her incredible beauty as a human was enhanced dramatically in her vampire life. She has the typical model looks of a tall stature, symmetrical features and a slender, statuesque figure. Her hair is golden and wavy that falls just to the middle of her back.