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The Hills is back for season 4, and the girls are beginning to make some big decisions that will set the course for the rest of their lives.

While Lauren struggles to balance the tension between her roommates, Audrina and Lo, she starts dating Doug, an old flame from Laguna Beach. Meanwhile, Brody, Audrina and just about everyone else warn Lauren not to trust her new friend, Stephanie Pratt (Spencer's sister). And when Lauren makes a surprising discovery about Stephanie and Doug, she realizes that her friends might be right.

Just as Audrina thinks it's time to let her boyfriend Justin go and begins dating Colin, Justin turns up the heat in their relationship, leaving her torn. Whitney rises up the ranks at People's Revolution much faster than she expected and meets a model in New York who could possibly sweep her off her feet. And Heidi deals with the consequences of moving back in with Spencer, including putting her job at risk. As if that wasn't enough, Heidi's sister Holly comes from Colorado for an indefinite visit, putting some serious pressure on her renewed relationship with Spencer.

During season 4 of The Hills, life in Los Angeles only gets more complicated as friendships, relationships and loyalties are tested like never before.

This season, Lauren has more to juggle than ever before. She moved into a house with her best friends Audrina and Lo, but the two of them can't seem to get along. With Lauren caught in the middle, it's up to her to keep the whole situation from falling apart.

Meanwhile, Lauren has started dating Doug, a guy from her home town of Laguna Beach. He's handsome, charming and wealthy - everything a girl could ask for. But sometimes you can't just pick up where you left off, so the two will have to decide where they go from here.

At work, just when Lauren is given more responsibility, someone is let go at People's Revolution and Whitney and Lauren may be on separate paths. Lauren also has her hands full with her newest friend, Stephanie, who happens to be Spencer's sister. Everyone keeps warning Lauren not to trust Stephanie, but Lauren is determined to make up her own mind. Will this be the season where trusting her instincts pays off, or will Stephanie Pratt prove her wrong?

All of Lauren's friendships are in jeopardy, but if Los Angeles has taught her anything, it's that good friends are worth fighting for.

Audrina has felt like the odd-girl-out ever since she moved in with Lo and Lauren. She wants to save her friendship with Lauren, but Lo is always getting in the way. She also has her hands full with Justin, who insists that they're in a casual relationship and can see other people. She puts this to the test when she meets a handsome model -- and Justin's reaction is something she never planned on. The big relationships in Audrina's life are facing major changes. And this season will determine if Audrina gets her way, or if she winds up on the outside looking in.

Whitney's career at People's Revolution is taking off, but the responsibilities are also getting more serious. She's got a tough boss in Kelly Cutrone, but at least Whitney is on her good side -- for now. When a coworker is fired, Whitney is picked to take her place - but that means jetting back and forth to New York to learn the next level of the business. Whitney has the talent to make it in fashion, but does she have the dedication? And when she meets an exciting new guy, will she be able to keep her personal life from interfering with her job? Big questions await, but Whitney might have to face them without the help of Lauren, her longtime partner in crime.

Heidi has finally decided to let Spencer move back into their apartment, but soon she'll have even more difficult decisions to make. After choosing Spencer over work after he stormed her business trip, Heidi has to deal with her boss. And, as if Heidi didn't have enough on her plate already, now her sister Holly is moving to Los Angeles -- and moving in with Heidi and Spencer. Spencer is not too pleased and promises he'll move out if Holly doesn't first. Putting her career on hold is one thing, but what will Heidi do when Spencer comes between her and her family?

Lo is about to graduate from college and enter the working world, but first she has to take care of business at home. She feels that Audrina has refused to put any effort into their friendship and she's not afraid to say so. Lo wants everybody in the house to get along, but she's also starting to think that she and Audrina will never find a way to be friends. Maybe they can co-exist in peace - or maybe it's time for one of them to move on.

Ever since she made friends with Lauren, Stephanie has been on thin ice with her brother Spencer. And inviting Lauren to her birthday party might be the last straw. Lauren's friends don't trust Stephanie, and Brody isn't afraid to tell her so to her face. Stephanie relies on Lauren, who sticks up for her every chance she gets. But when Stephanie goes after one of Lauren's boys, she realizes she may have lost her last ally.

Spencer made the big play in Vegas and won Heidi back, but he also got her in trouble at work and has a lot of making up to do. Just when he convinces Heidi to move back in and get their lives back on track, Heidi's sister Holly shows up in LA and moves into their apartment. Spencer has to find a way to get rid of Holly to save his sanity and his relationship with Heidi. But Holly's not the only sister causing trouble. Spencer's own sister, Stephanie, has become good friends with Lauren and Spencer feels completely betrayed. When he sees that both he and Lauren have been invited to Stephanie's birthday party, he plans a surprise for Stephanie, then plans to cut her out of his life for good.