Team Human by Justine Larbalestier and Sarah Rees Brennan (2012)

syndetics-lc
Very sweet and funny young adult novel about a town where humans and vampires live in (relative) peace. 

When a handsome vampire comes to her high school and falls in love with her best friend, Mel's world is turned upside down. Not to mention that her other best friend is still struggling with her father's decision to run away with a vampire. But Mel is not just going to sit back and let things happen. She investigates mysteries and is fiercely ready to protect her friends--even if they don't want to be protected. 

When she meets Kit, a human living with the vampires (and one of the most charming romantic interests ever), the plot thickens even more. Delightful.