Yes, I am one of *those* adults who reads The Princess Diaries series. I love Mia, the "princess" of these books; gawky and self-conscious, she is definitely an everygirl that teens can identify with. These books are often funny and heart warming, and they've pulled me along with them, though I have to admit that a few of the recent ones weren't quite up to par as the beginning of the series.
Now we come to #9, Princess Mia, and I'm pleased to say that Cabot's back in top form with this one. Mia's beyond depressed over the loss of her beloved Michael, and it shows; she refuses to leave her bed or even shower. Her parents eventually decide she needs therapy, and Mia reluctantly begins the climb back out of the depths of despair. Her relationship with Lilly seems to be over (hurrah!), and there's even a hint of love-to-come with J.P. There are no quick fixes for what ails our Mia, but she displays courage and maturity when faced with the decision to help Genovia convert to democracy.
The best in the series so far, my amazon review can be found at http://tinyurl.com/ysz6au. Do yourself a favor and pick this one up, even if you've not read all the others. It's definitely worth it!