A naive Jane volunteers to look after a "wholesome" teen model when she arrives in town to shoot the company's new ad campaign -- and she turns out to be a total nightmare. Piper is disruptive, destructive, and ready to party. Plus, she uncovers Jane's secret about being in high school, and uses it to her advantage.
Meanwhile, Ben is upset when Jane returns home late again. He decides to show some tough brotherly love and ground her. This doesn't make Jane happy at all -- especially since Nick is having a party and now she won't be able to go. Jane and Nick are getting a lot closer too, so it really bums her out. But when Piper decides she wants to go to this high school party (and tells Jane she'll expose her double life if she doesn't go), Jane has no choice but to break Ben's rules and go as well.
Lulu also convinces Billy to go to the party, but when Billy's brother arrives too, there is an altercation that leaves Billy walking out the door -- and Lulu not following him. Things go from bad to worse at the party when Ben shows up and busts Jane.
Thankfully, despite all of the drama at the party, Jane manages to get Piper to the all-important Donovan Decker shoot. Piper and Jane end up bonding and after a successful photo shoot, Piper advises Jane not to grow up too fast.