Doug Reinhardt and Paris Hilton had a great run. Who would have ever seen a breakup coming after six months and hundreds of nauseating PDAs?

THG NOTE: We did. Numerous times. Ever since they started dating.

In any case, despite the persistent engagement rumors (fostered by her, for attention) Paris and her boyfriend du jour have officially called it quits.

A rep for the ho-tel heiress confirmed the breakup, for which no reason has been given as of this posting, with the following statement today:

“In response to the inquiry on whether Paris Hilton has split up with Doug Reinhardt, yes, this is true, the couple are no longer together.”

“They remain friends and ask that you please respect their privacy.”

The pair had been together for six months, which is an eternity by her standards. Reinhardt’s rep, who better start sending out resumes, had no comment.

As the saying goes, all good things must come to an end. This saying also applies to Paris and Doug.

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Doug Reinhardt did not exactly try to stop Brody Jenner from cheating on Jayde Nicole on last night’s episode of The Hills. But in real life, he quickly sprung into action when some jackass tried to make a move on his girlfriend Paris Hilton.

A man who reportedly tried to grope the ho-tel heiress at a Los Angeles club Monday night was soon confronted by her boyfriend of several months.

The two were dancing at H-Wood when an intoxicated male clubber approached Hilton and tried to touch her cleavage, a witness tells Us Weekly.

Perhaps he just wanted a whiff of Paris’ new fragrance? Either way, her former terrible minor league baseball player beau intervened in a hurry.

“Doug protected his lady and pushed the guy,” adds another source. “That’s when all of Doug’s boys stepped in and beat the crap out of the guy.”

Doug Reinhardt then had security kick him out of the club.

Fellow clubgoers Jessica Alba and Cash Warren – who of course were dancing alongside Hilton and Reinhardt when this went down – were shocked.

“They looked at one another and were like ‘wow,’” says an onlooker.

Hilton and Reinhardt didn’t seem bothered by the brawl. They mingled with Brody Jenner around 1:20 a.m. before calling it a night shortly after 2.

A source also dished on the happy couple’s weekend plans:

“They are very much in love … They make the perfect couple. [They] are taking the family jet and headed to Kentucky for the Derby this weekend.”