Not bad, just kinda stupid. Told in alternating chapters by the spoiled rich princess who isn't necessarily as awful as she seems and the self-proclaimed film geek who plans to make a documentary about her. The diva's sudden change from "get away from me" to "hey, let's hang out, you can help me" is--well, believable in that she would see the benefit to herself, but I doubt she would actually start treating Josh as nicely as she does and let her guard down so much. 
 Then there's also Josh (the film geek) convinced that she's his Annie Hall, which, no. (Lessons learned from Mystery Science Theater: "never put a good movie in your crappy movie.") 
 I never did come around to liking the princess, and Josh is a weird blend of assertive drive to get his movie done and doormat to whatever his "subject" wants him to do. It'll find an audience (sigh) but so not for me.