Paris is getting her new beau James Neate in Big Trouble!

The hard-partying heiress' late hours are having a bad effect on her new beau, model James Neate - who was too busy having a blast with her in Los Angeles to show up for a shoot on Long Island last weekend.

"He was a day and a half late to Montauk for a fashion shoot for Details magazine," an insider reports by e-mail. To make matters worse, when Neate finally arrived, he "could hardly contain his excitement and was bragging about 'being chased by the paparazzi' and telling the crew how cool it felt 'to actually ride in a Maybach,' " our spy sneered.

"He also asked for a change of underwear and a toothbrush since he 'hadn't been home in a couple days.' " Details was so angry at Neate's lack of courtesy, it "won't be calling him or his agency, Request Models any time soon." A rep for Details declined comment.

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