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Jenner, along with Lauren Conrad and Audrina Patridge, reveled in all-night partying and daily beach lounging at the LG Villa, a private mansion in the Mexican resort town.

The trio, of the same kind with well as Jenner's buds Frankie Delgado and Doug Reinhardt, arrived Thurs., Aug. 21—Brody's actual birthday—and got down to some serious fun.

"They went bananas," a source tells E! News. "They partied until about 3 a.m.—cocktails, birthday concrete, in and out of the pool."

The next twenty-four hours was spent surfing and tanning, and that time as the sun set, the reality stars headed into downtown Cabo, where they drank through locals before heading back to the estate for one more party.

"Friday night was crazier—they were up until 8 a.m., beer and margaritas all darkness," the discover says.

Each of the guys had his have a title to accommodations at the seven-bedroom estate, but Lauren and Audrina opted to share the Honeymoon Suite together.

And where was Lo Bosworth in the unite?

"Nowhere to be found," the head said. "Lo doesn't really know him. It was Brody's trip, reasonable his close friends," says the spy.