Scott Disick needs to take a step back from partying -- at least according to Kris Jenner.

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Following a brief stint in rehab last month, Disick was reprimanded by his girlfriend Kourtney Kardashian's mother prior to her birthday celebration.

"You need to lay off the alcohol," Jenner tells Disick in a sneak peek at Sunday night's new episode of Keeping Up With The Kardashians, via a Celebuzz report on Tuesday.

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As the clip continued, Jenner and Disick were seen at a nightclub, where they were celebrating Jenner's birthday, surrounded by plenty of alcohol. However, despite Jenner's warning, Disick was seen drinking bottle after bottle of beer, which led Jenner to tell her friends and family, "I can't believe he got drunk."

As the clip concludes, Jenner is seen telling Disick, "You're an a--hole."

Although Disick enterred into treatment last month, he only remained on site for one week. After he left, he spoke to PEOPLE Magazine, claiming he will one day return to the Rythmia Life Advancement Center in Costa Rica.

"The funny thing is, a lot of people were under the impression that I was going to this rehab facility in Costa Rica for a month, when the truth was, I was going for a week for one treatment that they have there," he said. "I'm not done. I plan to go back to this place."

Keeping Up With The Kardashians airs Sundays at 9 p.m. on E!

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Kris jenner, E!, Reality TV, Keeping Up With The Kardashians, Scott disick