Previously on 'The Hills'
'The Hills' theme song
Audrina and Lo pick out a cake for Lauren's birthday.
Stephanie and Heidi prepare for Lauren's party.
The girls arrive at the deck with a blindfolded Lauren.
Spencer and Charlie arrive at The Dime for a boys' night out.
Heidi and Stephanie arrive at Lauren's surprise party.
Lauren asks who invited Heidi to her birthday.
Cameron watches Spencer with Stacie from across the room.
Lo has an awkward talk with Heidi and Stephanie receives a text from Cameron.
The yacht party continues.
Spencer hits Cameron.
Lauren goes to check on Heidi.
Lauren consoles Heidi.
Lauren comforts Heidi, the night continues.