The first book of the Sweet Valley High series. This series has been revamped so there is another Double Love floating around that has 2000s type references instead of 1980s references.
The story: Elizabeth and Jessica are identical twins. They are popular, smart, and gorgeous, but outside of that, completely different. Both of them want the same guy - Todd Wilkins, the basketball team star. What will they do to each other to get the guy they want?