In the 100th episode, the gang travels to Costa Rica, where drama ensues between Brody and Kristin. Stephanie meets a new man, while Kristin makes a big move for Brody, but it seems she is too late. In the series finale, Kristin must decide if she's going to make a major change in her life, which may force Brody to make a decision about their relationship.
Kristin meets a bartender named Will, and sparks fly. Audrina chooses a new, independent life without Justin, but will that be the right choice?
Originally, he was supposed to return after anger management and a six-week hiatus from the series, but his behavior later worsened causing him to be completely removed from the cast.For the first time since her extensive plastic surgeries, Heidi reveals the new look to her family.Lo, Stephanie, and Audrina confront Kristin about her partying ways after a rocky Super Bowl weekend in Miami.Meanwhile, Brody's attraction to Audrina resurfaces. Following her DUI, Stephanie tries to reconcile with her brother, Spencer.After their underwhelming responses, she and her husband Spencer Pratt begin to alienate their family and friends.
Meanwhile, Cavallari has become friends with Audrina after feuding with her during the prior season, and resumes a flirtatious relationship with her best friend and ex-boyfriend, Brody Jenner.
Audrina finds herself conflicted with her relationship with her on-again/off-again boyfriend Justin Brescia, while Bosworth and the female Pratt are depicted as mutual friends of all.
The series finale garnered media attention after it depicted the final scene being filmed in a studio backlot, responding to longtime speculation that the series was scripted.
The fourth episode of the season, "This Is Goodbye", which aired on May 18, 2010, marked the final appearance of Heidi Montag and Spencer Pratt from The Hills.
Pratt was kicked off the show after threatening to kill a producer of the series.
The Hills focuses on the lives of Kristin Cavallari, Audrina Patridge, Lo Bosworth, Heidi Montag, and Stephanie Pratt.