Kathryn Merteuil & Sebastian Valmont
As Seen In: "Cruel Intentions"
Played By: Sarah Michelle Gellar and Ryan Phillippe
Infamous For: Hooking up with each other, manipulating people for their own gains, doing cocaine
Take Chuck Bass of "Gossip Girl," clone him, and make one of them a girl. Presto! You've got these twisted step-sibs.
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