The season was filmed from April 2007 to March 2008 in Los Angeles, California, with additional footage in Crested Butte, Colorado; Las Vegas, Nevada; and Paris, France.

The Hills focuses on the lives of Lauren Conrad, Audrina Patridge, Whitney Port, and Heidi Montag.

During the season, Conrad ended her friendship with Montag after suspecting that she and her boyfriend Spencer Pratt fabricated rumors of a sex tape involving herself and ex-boyfriend Jason Wahler.

At Teen Vogue, Whitney struggled with her new position as the Direct Supervisor to the interns after a break-up with a longtime boyfriend.

and Lauren got a second chance with Lisa Love by being sent to Paris to assist with the Bal des Débutantes with Whitney by her side.

After realizing that staying behind the scenes at Teen Vogue wasn't for her, Whitney got a new job working for the fashion PR firm, People's Revolution, and brought Lauren along with her.

The two went on a "relationship vacation", and Spencer consequently moved in with his sister, Stephanie, who managed to put herself in the midst of the 'Lauren vs Heidi' feud after befriending Lauren while taking a class at FIDM together.

In the season finale, Heidi put her job at Bolthouse in jeopardy after going home with Spencer, who surprised her during a business trip to Las Vegas, and Audrina argued to Lauren that it was Lo who was pulling their friendship apart.

[1] The first half of season 3 made The Hills MTV's number one show and on cable among P12-34, reaching a total of 100 million viewers both online and on television.

[2] The second half, which premiered in March, was the highest rated cable telecast of the year among P12-34, with an average of 4.7 million viewers.