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BRINKLEY-SPLIT SIREN SPOTTED

The young woman at the center of the bitter divorce battle between Christie Brinkley and her wayward husband was spotted yesterday huddling with her lawyer in the Hamptons.

Diana Bianchi ate breakfast with Rosemarie Arnold at the chic East Hampton restaurant Maidstone Arms, presumably to prep for her highly anticipated turn on the witness stand on Wednesday at Brinkley and Peter Cook’s divorce trial.

The 2006 outing of the then-teenager’s affair with Cook ended his 10-year marriage to Brinkley and set the stage for what is expected to be a courtroom slugfest.

The Post reported last week that Cook arranged to pay Bianchi $300,000 in exchange for her silence about their affair. Bianchi, 21, is still receiving installment payments, a source said yesterday.

She will likely be followed on the stand by Carri Lyn Ciamarra, a Westchester fitness model who acknowledged having a “relationship” with Cook after his split with Brinkley beginning in February 2007.