The Hills Universe: Who's Who on TV's Hottest Show

Who? Heidi Montag, LC's blonde sidekick turned surgically enhanced blonde nemesis. After befriending Conrad at fashion school, Montag moved to Los Angeles to be her roommate. The two had a falling out after Montag began dating Spencer Pratt — the spat began over either a Lauren sex-tape story Heidi and Spencer leaked to the press (Lauren's version; they deny it) or Lauren's jealousy of Heidi and Spencer (their version; Lauren denies it).
Occupation: Promoter for event-planning firm Bolthouse Productions, designer of her Heidiwood fashion line and budding pop singer (her low-budget video for dancey track "Higher" was an Internet sensation for all the wrong reasons, but helped her break the Top Ten on the iTunes chart).
Hills Role: Frenemy to some and, strangely, neo-feminist icon to others
Defining Hills Moment: To everyone's chagrin, dropped out of FIDM in Season 1 to pursue a career in partying, er, party promoting.