This book is a novella.

Lily MacIntyre's life is offtrack, and she knows exactly how to right it: shed her America's sweetheart image in a big way. Getting down and dirty in a limo with rocker Nate Lansford seems like the perfect solution. Plus, she's had a mad crush on him practically since birth. The only problem? Nate is her brother's best friend…and he doesn't see her as anything other than a surrogate little sister.