Since this is Britney's game, it should be obvious that she would make at least one appearance. During the introduction, a CGI version of Britney welcomes you to the game. It's cool to see, however there's just something about the model that is liable to scare small children. The in-game model of Britney is excellent. The face is a little stiff looking, but it's still a good likeness.
You would think a game with a multi-platinum selling singer's name attached to it would have a good soundtrack. Any you would be right. What I can't understand is why there are so few songs. Let's do the math. In her short career, Britney has released three albums. Each CD has about 12 songs on them, making for a total of roughly 36 songs. So why are there only 5 songs in the entire game? Baby one more time, Stronger, Oops...I Did It again, Stronger, Slave 4 U and Overprotected - that's all you get. On the GBA version this was forgivable due to limited space, but the PS2 version is on a DVD, so space shouldn't be that big an issue. I'm not a big Britney fan and even I can name at least two or three songs off the top of my head that could be used - more if I actually cared to do some research.