Seven new Bad Girls break into their new home and waste no time ganging up on their least favorite roommate. The first night out proves to be a disaster when the girls get bounced from several clubs for their bad tempers.

Tiffany and Kayla call a temporary truce, but Ailea continues to fuel the fire. Amber B. breaks off her relationship with a boyfriend back home just in time for the girls to go speed dating.

Whitney demands an apology from Kayla for her remark. Ailea and Tiffany watch, but when the girls start throwing things, they step in to break up the fight. Sarah and Amber B. commiserate at the pool about not being the hottest girls in LA. Then Amber B. gets a guy and rubs it in Sarah's face causing a rift. The girlfriends are shocked when they meet Ailea's Internet boyfriend. Kayla is rushed to the hospital after a drunken night at a strip club.

Kayla returns from the hospital with little to no memory of the events from the night before. Tiffany reaches her breaking point with Kayla and her wild antics and suddenly abandons her neutral position in the house. Meanwhile, tension builds between Ailea and Amber M. as Ailea grows tired of her rude comments towards Kevin. And a budding romance gets steamy between Amber B. and her new boy toy Greg until she discovers some of his lies he told her and secrets he kept from her.

Tiffany's friendship with Marcus becomes more serious, even though she has a boyfriend back home. The Bad Girls get their first job selling lingerie to people on the streets of Los Angeles. Meanwhile, Whitney's hard-nosed facade begins to crack in the wake of her friend's death. The two Amber's get attacked in the club, which results in an all out brawl between the bad girls and local club goers. Tension between Kayla and Amber M. reaches its breaking point, and it results in a nasty cat fight between the two, which ends with Kayla leaving the house.

Amidst a growing division in the house, the Ambers play a prank on the other girls with the help of Bad Girls vet Tanisha. The girls go surfing, and Amber M. gets a little close with their instructor in the club restroom. Amber M's pranks take a toll on Whitney and ignites a confrontation in the limo. Guest stars: Season two's star Tanisha Thomas

The newest bad girl, Ashley puts the Fab Four on instant defense, but the Ambers jump at the opportunity to make an ally. Ailea hooks up with a local club goer, and fears the impact of a drunken mistake on her relationship with Kevin. New roommate Ashley joins the club.

The girls descend upon Las Vegas, where gambling, partying, and wedding bells ripple through Sin City. A small joke by the Ambers strengthens the great divide in the club, and leads Ashley to question her allegiance to the blond duo. The girls band together to put on a sexy live stage show, living out the ultimate Fantasy in Sin City. Guest stars: Fantasy Girls, Carrot Top and Cris Judd.

It's all out war when Ashley joins forces with the Fab Four and brings some explosive revelations about the Ambers with her, while Sarah gets serious with her relationship with Noah and decides to take an uncharacteristic approach to their relationship. The Fab Five become apart of bar brawl at a rock concert.

As the dust settles from an explosive evening, the Ambers find themselves outcasts in their own home. Kayla makes a surprise return.

Kevin tries to win Ailea back, but a handful of hookups prove that Ailea has other plans. The girls take a walk on the wild side as they rub shoulders with the porn industry at a movie premiere. A surprise trip to Cancun, Mexico causes an even deeper divide among the roommates. A mix of alcohol and heightened tensions turns ugly when a domestic fight erupts into a street brawl. Guest stars: Jessie Jane and Evan Stone.

The girls try to piece together the circumstances surrounding the street fight in Cancun, and come to terms with the reality that one of them may be sent packing for good after the local authorities intervene. Whitney and Ailea must leave the house.

"The Amber Show" comes alive in Hollywood where the Ambers take a trip down memory lane exposing never-before-seen footage from the third season.

The girls return from Mexico for their final days in the house. But the days don't end quietly as all hell breaks loose when Amber M. admits that she has a problem with Tiffany's closest male friend. Sarah admits to Noah that she was unfaithful in Cancun, while the girls are determined to make sure Amber B. stays away from Scott when she returns home.

Perez Hilton host as The Ambers, Tiffany, Sarah, replacement roommate Ashley, and even expelled members Kayla, Ailea and Whitney reunite for the first time together since production wrapped five months ago.