Bet Kris Jenner is totally regretting letting Scott Disick convince her to celebrate her birthday in Vegas.

In a recent episode of Keeping Up With the Kardashians, Kourtney’s baby daddy was totally wasted during Kris Jenner’s birthday party – barely able to stand and getting rowdier by the minute. At one point, he even hit the birthday celebrant on the head with a champagne cork!

The night was a disaster from the get-go. Jenner was enjoying a quiet dinner with boyfriend Corey Gamble and her friends when Disick arrived late, and it was obvious he already had a few drinks in him.

The self-proclaimed Lord was rude to the birthday girl and her friends and was openly drinking, something that got the reality mom understandably worried.

“I’ve really got to get him to slow down or we’ve got a huge problem,” Kris confesses.

Unfortunately, things went from bad to worse when they got to 1Oak. By this time, the professional party animal is already so drunk he can barely stand. But he still had the energy to try and rap while spraying people with champagne, including Kris.

The Kardashian matriarch understandably flipped out after being hit by a champagne cork and started screaming at Disick.

“What the f*** are you doing?” she yelled. “You f***ing hit me in the head.”

However, that Disick was a far different Lord from the one who showed up at Kourtney Kardashian’s 36^th birthday party.

Maybe it was an attempt at making amends, but Disick was sober (and somber looking) during this Las Vegas party.

The bash, which was also held at 1Oak, was relatively drama free and the eldest Kardashian sister appeared to have enjoyed herself, despite the fact that the rest of her family was a no-show.

The KUWTK mainstay was presented with an ultra large cake before she partied the rest of the night away.