They were the runner-ups on the British version of Then: Audrina was dating/not dating (still not sure what that was) Justin Bobby.
A rift was created in her relationship with LC when she moved in with her and Lo.
Now: While Audrina had her eyes set on becoming an actress, she's had roles in a couple movies: Then: Caught in the middle of the feud of Speidi vs. While Stephanie was family to Spencer and Heidi, she slowly became really good friends with LC, much to Speidi's ire and straining her relationships across the board. LC's arch nemesis, Kristin soon attracted the wrath of other cast mates, going so far as to steal Justin Bobby from Audrina.
Now: Kristin has managed to shed her bitchy persona.
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At one point during the concert, Bieber went on stage to speak to the crowd.