Movies like Liar, Liar, Vampire

When Davis, a vividly daydreaming 17-year-old Aussie male, enters his new American high school (one rife with chowderheads steeped in the lore of the Twilight books and films), Caitlyn, the school's most popular queen bee, mistakes him for a vampire. Vi (literally the-girl-next-door) likes this disruption to the stagnant social order and helps Davis build into the error, leading the lad to widespread popularity. Can Davis be honest with Caitlyn without bursting her bubble and alienating her and his new classmates?