Vivian Crabbe (b. 1980) is a pure-blood witch, the daughter to Death Eater Crabbe Sr, and the twin sister to Dark Wizard Vincent Crabbe. She was a student at Hogwarts, and like her family members, she was sorted into Slytherin house. She is best friends with Draco Malfoy, Blaise Zabini and Daphne Greengrass. She survived the Battle of Hogwarts in 1998.
Vivian Crabbe is born into the pure-blood Crabbe family. Her twin brother is Vincent Crabbe, and her father, Mr. Crabbe was a Death Eater. This likely influenced her prejudice against Muggle-borns and other non pure-bloods. Vivian was related, in some way, to Irma Black.
At the start of her first year, she was sorted into Slytherin house, along with her brother, her best friends - Draco Malfoy, Blaise Zabini and Daphne Greengrass, and her brother's friend, Gregory Goyle. Harry Potter had noted that Vivian was the prettier twin of Vincent.