Pretty much anything that's by Meg Cabot.
A lot of her books are aimed at teens and they usually have a bit of romance in them.
-- The Mediator series, the Princess Diaries series, Jinx, How to be Popular etc.
There's a whole list of books that I read & liked.
(If the link doesn't work, let me know & I'll post a more direct link)
& NO THUMBS DOWNS for posting a link instead of a list... I used to write out the list all the time, and you know what? I got cramps in my fingers from re-writing it so many times...