Heidi Montag drops by The Abbey; Marissa's mom travels to L.A. to try to convince her baby to come home; Lawrence and Brandi find out if they're 'fit' to be parents; Cory and Murray's relationship reaches a breaking point.

Kyle learns Marissa has a boyfriend back home; Cory decides to try to work through his issues with Murray; Elizabeth has a meltdown when she feels she's been disrespected by Kyle.

The Abbey crew heads to Palm Springs for a photo shoot where Billy and Ashlee heat things up; Chelsea can't manage her anger towards Ashlee and Murray after Kyle instigates a rumor.

Kyle thinks his relationship with Marissa is on the right path; Ashlee meets Billy's brothers; Brandi and Lawrence hit a roadblock on their journey to become parents; Kyle has a major party foul when he reveals a juicy rumor.

The crew heads to Vegas where trouble starts to brew for Elizabeth and Kim; Kyle grows more confused when Marissa plays hot and cold; Cory and Murray decide to make a pact; David reaches the end of his rope with Chelsea.