Jessica's Guide to Dating on the Dark Side by Beth Fantaskey
The undead can really screw up your senior year... Marrying a vampire definitely doesn't fit into Jessica Packwood's senior year "get-a-life" plan. But then a bizarre (and incredibly hot) new exchange student named Lucius Vladescu shows up, claiming that Jessica is a Romanian vampire princess by birth - and he's her long-lost fiancé. Armed with newfound confidence and a copy of Growing Up Undead: A Teen Vampire's Guide to Dating, Health, and Emotions, Jessica makes a dramatic transition from average American teenager to glam European vampire princess. But when a devious cheerleader sets her sights on Lucius, Jess finds herself fighting to win back her wayward prince, stop a global vampire war - and save Lucius's soul from eternal destruction.