Heidi Montag and Spencer Pratt were busy yesterday filming The Hills in LA. Mrs. Pratt was recently joined in the scantily-clad magazine posing department by Audrina Patridge and her racy Maxim spread, but Heidi was all covered up in a flowy top for the afternoon of work. The premiere of what will be Audrina's final season on the MTV show is just a few weeks away, when we can look forward to seeing Heidi's apparent baby fever.

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