Paris Hilton’s Halloween celebrations were reportedly marred by a horrific row with boyfriend Doug Reinhardt after the reality TV star tossed his girlfriend’s cell phone out of their limousine.

The couple was enjoying an evening out in Hollywood on Saturday, attending the annual costume party thrown by Heidi Klum and Seal.

But after they left the fancy dress event, the pair allegedly became embroiled in a furious row as they got into their car.

Witness Ramon Alves tells the New York Post, "She was mad. She jumped in the front seat and (Doug) was holding her around the neck saying, ‘Relax, relax.’"

The argument then reached a climax when Reinhardt allegedly threw the hotel heiress’ cell phone through the car window – forcing Hilton to stop the vehicle and search for the device.

A second witness adds, "She was staggering down the street, up and down. And the guy they were with was trying to block anyone from taking pictures. It got very physical. The limo driver was horrified!"

Via – WENN