Tori Spelling and Brandi Glanville stop by and throw newbie Marissa off her game. Meanwhile, temperatures flare as a rowdy staff party turns into tears.
Heidi Montag drops by. 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.
After Kyle learns Marissa has a boyfriend back home, he sets his sights on another. Cory decides to try to work through his issues with Murray, but it doesn't last long when drama unfolds at Lawrence's charity event. Elizabeth has a meltdown and causes a scene when she feels she's been "disrespected" by Kyle.
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.