The school mourns Ricky's death and hold a vigil/kegger party to express their feelings. Sadie and Tamara reluctantly bond over their anger at Ricky. Jenna has a pregnancy scare but confides in Jake instead of Matty. Jenna joins a creative writing class and meets Collin, a charming classmate.
Jenna's realizes she may have feelings for Collin after he keeps popping in her head while writing. Ming deals with Becca with physical violence.
Jenna's parents finds out that she and Matty are sexually active and insist on telling Matty's parents. The McKibbens come over for dinner and the two families argue over their parenting styles. Meanwhile, Tamara and Jake are contemplating sex for the first time.
Matty moves in with the Hamilton's after a dispute with his parents, but it proves to be too stressful for Jenna. Tamara invites herself to a sleepover at Sadie's despite Jake's warnings.
Jenna and Collin nearly get arrested for smoking pot in his car. Jenna further alienates herself from her friends, as well as her parents. Jenna's friends and family try to warn her that Collin is a bad influence. Ally becomes Sadie's legal guardian.
Jenna still feels guilty about losing Val's job, so she seeks to make amends. She enlists her mother's help to get Val to attend the school hearing and raise support for Val. Meanwhile, it's prom season at Palos Hills and Jenna is convinced that Matty will ask her in the midst of their renewed friendship. Ming faces a coup d'etat from the Asian mafia when former leader Becca returns.
Jenna befriends the new girl, Bailey. Lacey's new job as school nurse attracts the attention of all the boys in school. Tamara and Ming agree to be friends with Jenna again on probationary terms. Matty's parents divorce and he throws a party. Sadie tries to get Austin to make a move. Jenna hopes to get back together with Matty after learning of his break up with Devon but sees him with another girl. After Jenna gets drunk and kisses Jake, Tamara and Jake make up as they lecture Jenna. Jenna tries to apologize to Val, who tells her that she's been fired.
Jenna desperately wants to cut ties with Collin, but finds it hard to be faithful. Tamara has trouble keeping secrets. Lacey wants to throw Jenna a surprise party, but ends up canceling it when Jenna expresses her disinterest in celebrating. In a surprise turn of events, everyone gathers at the Hamilton house for the party, but they are all in shock as Jenna and Collin walk in making out.
Everyone gathers to re-tell what happened at Jenna's party and to speculate whether or not Jenna and Matty are still a couple. Jenna refuses to leave her house and Lacey prods her for information. Jenna and Matty finally meet up. Although Matty is willing to eventually forgive Jenna and go back to the way they were, Jenna breaks up with him, thinking that they both probably deserve better.
Matty still wants to get back with Jenna, but she is now officially seeing Collin, much to everyone else's disapproval. After rejecting Austin's advances, Sadie sets him up with Lissa but soon has a change of heart. Jenna throws a barbecue to formally introduce Collin to all of her friends, but things don't go as planned. Jake becomes furious with Tamara after finding out that she knew about Jenna's cheating. Thinking that her best friends stood her up, Jenna harasses Tamara and Ming over text messages, leaving her with no friends except for Collin.
Three bored companions experience an awkward moment when they introduce beer to the situation.
At Ally's rental beach house in Rosarito, Mexico there is enough sun, sand, sex, secrets, and shenanigans to go around.
Get a recap of everything that went down on the season finale.
Greer and Molly dish on Tamara's engagement.
Download the TV Guide app for iPhone, iPad and Android!