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Previously on 'The Hills'
'The Hills' Theme Song
The gang arrives in Las Vegas for Frankie's birthday weekend.
Heidi and Spencer fight about Holly.
The girls meet up at the boys' suite.
Justin and Audrina arrive in Vegas.
Holly arrives at Heidi and Spencer's in LA.
Tension occurs at Frankie's birthday dinner.
Lauren follows Stephanie to their room.
There's tension at the club between Audrina and Lauren.
Spencer shows up at Heidi's work to talk about Holly.
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