Adrian is in a deep depression, refusing to leave the house, while Ben struggles to keep it all together after losing their baby. Ben has returned to school, but is devastated and angry about the situation. Ben asks Amy to visit Adrian at home to help her through this difficult time. Meanwhile, Amy feels a little guilty for being so happy in her own life – she’s in love with Ricky and their relationship seems to be growing stronger by the day. Ricky insists they shouldn’t feel guilty and invites Amy and John to move in with him.

Betty applies her own brand of comfort for Adrian's mourning. Ashley decides to go ahead with her cross-country road trip.

Grace goes away on a medical mission, while Peter suspects the worst.

As Ben continues to examine his options, he and Adrian have a huge blowout. Adrian finally gathers the courage to take all of the baby's things out of the would-be nursery.

Adrian comes to Ben's defense as a bunch of students begin to blame him for their daughter's death. Kathleen has an interview at a college. Grace gets pranked by Ricky.

With the help of Amy, Ricky tries to get in to college. Grace is having trouble fitting in to Daniel's college life.

It's time for senior prom!! Amy is mad that Ricky doesn't want to go so she pressures him into taking her to prom. Adrian and Ben go together, and Amy finds out Adrian is trying to get pregnant. Later, after the dance Adrian tries to seduce Ben into sleeping with her so she can be prego and keep him in the marriage.

Adrian has a new goal in mind.

Nora finds a new place to live, Ricky has an unexpected visitor who has run into legal problems after texting nude photos of his girlfriend, and Grace plays matchmaker

Adrian is introduced to the brother of one of Daniel's friend, and sparks fly. Amy hopes for a proposal from Ricky -- who has a surprise of his own.

Mid-Season Finale: A marriage is on the rocks. The wife is going to college and files for divorce -- and it's not Adrian. The seniors prepare for graduation.

It's graduation day - and both Ricky and Jack have something to say. A divorce attorney obtains incriminating photos at the graduation ceremonies.

Amy and Ricky are now engaged, but Amy starts to consider what marriage may really mean.

Summer school is the backdrop for another series of intrigues: Amy, Madison and Lauren argue, Henry is in the doghouse with both Ben and Alice, and someone is found to be trying pot.

Kathleen struggles with a decision whether or not to allow a boy from the country to stay with them instead of attending boarding school

Amy is increasingly short with everyone in her life, including Ricky, leaving him wondering what is going on with her, but he is not prepared when she reveals that she might be pregnant again. Ben, determined to get permission from Dylan's parents to see her, makes another attempt to win them over, but it doesn't turn out quite like he hoped when he ends up sharing too much information about his family. Grace is unsure how to react to her mother's shocking news about the secret her father kept from everyone and turns to Jack for support. And, Anne's evening with Nora raises questions for George.

Dylan and her pals surprise Ben at school, while Grace doesn't want Jacob attending school with her. Elsewhere, Kathleen tries to understand her late husband's secrets; and an overburdened Amy acts ornery at home with Ricky.

Ben and Dylan go on their first real date together. Elsewhere, Tom runs into problems with police.

A desperate Kathleen resorts to bribery to get Grace to talk to Jacob. Elsewhere, Dylan attempts to befriend Adrian.

Amy learns she's doing poorly in summer school, so her dad tutors her and provides her with some life advice.

Amy announces a wedding date, and the news travels quickly. Meanwhile, a rumor concerning Anne surfaces.

Amy's mistaken about why she's the focus of gossip, and Grace grows jealous of her. Elsewhere, Ashley and her mom return from traveling abroad; and Ben asks his father to let him enroll in Dylan's school.

In the fourth-season finale, Anne reveals some news to her loved ones. Meanwhile, Ben considers transferring to Dylan's school.