Separately, Julia and Maggie are upset by their pending Sweet 16 parties, yet when they come together, a fantastic idea takes hold and nothing turns out as expected.

In the process of moving and meeting new people, Lucy changes her identity in order to fit in, which backfires when she is faced with invitations to three radically different sweet sixteen parties.

Driving. Dating. A real social life. And the one extraordinary night where it all comes together...the Sweet Sixteen party is the coming-of-age celebration to end all celebrations. Whether it's a roaring good time or a total bust, it will be a memory to last a lifetime.Six parties, six locations across the country—each unique and totally unpredictable. Join six different heroes and heroines as they plan and celebrate their own Sweet Sixteens. The fun is just getting started... It's Kari's one night to make a big impression on the guy she's secretly loved since seventh grade—and a Sweet Sixteen bash at an old South Carolina drive-in seems the perfect place to do it. But when things go haywire, the impression she makes isn't quite the one she had planned...

When Trent and Laurie, the most popular couple in school, decide to throw a Sweet Sixteen party as a joke for Trent's tutor, the tables turn when Trent falls in love with the target of their cruel joke.

Marisa, celebrating her sweet sixteen, and David, celebrating his high school graduation, get more than they bargained for when they are forced to share party space.

When Sunny and Matt separate in an ugly breakup, they decide to throw rival sweet sixteen parties that cause an intense rivalry between the boys and the girls.