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It continues to be so on between 'Hills' co-stars Heidi Montag and Lauren Conrad. When the two ran into each other at a Hollywood hotspot last weekend, some serious gauntlets were thrown down, says US Weekly. Lauren, Audrina and Lo totally had a dance off against Heidi and her peeps, OMG! No word as to who won, but we suspect they couldn't hold a candle to the "Saved by the Bell" kids during that dance-off-at-the-Max episode. [US]