It's over for Audrina Patridge and Ryan Cabrera. They had a good four months of dating going. We are sad it didn't last longer for them. But we're not shocked.

The Hills star cycles through boyfriends in prolific fashion, as we all know, and a source confirms that she and her latest one split up "a little over a week" ago.

"Things started to go awry the night of her birthday and she ended things after that - pretty much the next day," explains an insider of the now-former couple.

Audrina Patridge, who just turned 25, and Cabrera, 27, spent May 9 in Las Vegas partying at Liquid Pool at Aria, then later at Las Palmas Latin Supper Club.

Ryan Cabrera and Audrina Patridge have called it a relationship.

Things seemed to be going so well, too, but they took a turn for the worst early this month. The biggest issue behind Audzo's breakup with the lame singer?

"Ryan’s a constant partier and that became an issue," says the source. "Audrina was crying at Wango Tango ... MTV made her film and she didn't want to."

The former couple first dated several years ago, and then rekindled a romance last January. They were spotted vacationing in Mexico together in February.

Patridge's last on-screen romance was Justin-Bobby Brescia, ending last year. There was also Corey Bohan ... and Tal Cooperman, and Brody Jenner, and ...