Scott Disick will soon be the father of three children by longtime girlfriend Kourtney Kardashian, but the fun-loving playboy was partying like a fraternity pledge this weekend. In fact, after a long night of celebrating his birthday, Disick was too wasted to show up at a charity golf tournament.

While the pregnant Kourtney Kardashian was helping to host the first birthday party for her sister Kim’s daughter, North West, her baby daddy was having his own belated birthday bash at 1Oak in the Hamptons, a nightclub owned by Disick’s pal Scott Sartiano. The 31-year-old father-to-be was photographed by paparazzi as he smoked and drank into the wee hours.

As Paul Micheli of DJ Prep ex told Radar Online, “He started smoking cigarettes and drinking beer. He seemed pretty wasted.” Disick was presented with a cake in the shape of a crown at about 1:15 am and finally departed for home in the company of a few friends around 2:30 am.

After such a long evening of imbibing, Disick probably did not feel too great in the morning. Maybe that is why he was a no-show for the Hamptons Golf Classic sponsored by Haute Living to benefit the Diamonds in the Rough Foundation. A source that attended the event told UK tabloid, MailOnline, the organizer of the tourney “patiently waited as Disick’s tee time approached and the avid golfer and Hamptons-native never showed!”

This behavior is likely to cause more trouble in Disick’s already troubled relationship with Kourtney, who is now three months pregnant with the couple’s third child. The 35-year-old mom of Mason, four, and Penelope, two, had already tossed Disick out of the couple’s rental home in the Hamptons following an angry argument over his partying.

Since Disick’s birthday was nearly a month ago on May 26, maybe it is time for him to cease the celebration and get home to his family—while he still has one.