From: www.nypost.com

The party-hearty heirhead and her boyfriend du jour, Doug Reinhardt, were spotted in an apparent boozy grapple early yesterday -- with him reaching from the back of their limo to put his hand around her throat in a move that stunned even jaded Sunset Boulevard denizens.

"She was mad," said lensman Ramon Alves. "She jumped in the front seat and [Doug] was holding her around the neck saying, 'Relax, relax.' "

Hilton, 28, and Reinhardt, 24, started out Halloween night sporting goofy, matching tooth-fairy outfits at a bash thrown by "Project Runway" glamour girl Heidi Klum and her singer-husband, Seal, in West Hollywood.

The limo came to an abrupt stop, and a tipsy Paris stumbled out, peering up and down the street to find her phone as traffic -- and pedestrians -- came to a halt.

Failing to find her phone -- it was later located and returned by a paparazzo -- Hilton climbed back into the limo and began ranting at Reinhardt for throwing it out the window, the witness said.