Fearless Fourteen by Janet Evanovich.
To address something I've heard a lot of people say lately. Janet Evanovich is becoming formula. It's predictable. I have to agree. Things are getting predictable. You know Stephanie is most likely going to get the bad guy. You know Ranger is going to break the laws. You know Morelli isn't going to break the law. But you never know how it's going to happen. It makes you laugh. So what if you know the general story line if you end up rolling on the floor anyway. :)