The Season Four opener introduces seven new girls -- Annie, Flo, Kate, Kendra, Natalie, Portia and Amber -- who sweoop in on a luxury Los Angeles mansion and try to coexist with one another.

Natalie tries to assert her authority in the house while Kate tries to stand up.

Flo deals with betrayal while Kendra makes a big decision.

A battle among two of the roomies will result in someone going home.

The new girl Lexie arrives to the house and is already asked to choose sides.

A visitor comes to the house and stirs trouble.

Tensions arise in the house over a dating choice.

Alliances continue to shift in the house while Annie becomes empowered.

Kate dooms her relationship; Natalie and Flo duel.

One of the girls will say goodbye while Natalie toughens up.

The girls take a break from the house, but drama finds them; Natalie and Kendra have a street brawl.

A fight takes place and a family visits.

Old wounds are opened when the girls are shocked to find their former roommates back at the house for a final, explosive photoshoot. Meanwhile, Falen and Julie grapple with their future after their steamy hookup.

The girls catch up. Part 1 of 2.

The girls catch up. Part 2 of 2.

A group of rebellious women are put in a house together in an experiment intended to moderate their behavior.