Just weeks after Khloe Kardashian filed for divorce from her husband Lamar Odom, her older sister, Kourtney Kardashian, is pleading for her boyfriend, bad boy Scott Disick, to go back to rehab for his drinking problem.

Disick had previously checked into rehab in 2010, but since losing his mother, Bonnie, on Oct. 28, his drinking has gone back into a downward spiral.

An insider told The National Enquirer, "Kourtney is beside herself. She was giving him time to grieve, but now he's drinking with a vengeance."

Disick's, 30, latest antics occurred during a Kanye West Yeezus concert during a stop in Houston, TX on Dec. 7. Disick was noticeably unable to walk and stand up straight. He eyes were also blurry. Kardashian, 34, wants him to get his act together before they tie the knot. She also wants Disick to get his drinking issue in check for their two children, 4-year-old Mason and Penelope, 18 months.

The source said, "[Kourtney] wants him back in rehab or going to AA meetings at the very least. They've got a wedding to plan for next year and she's not having it ruined by a drunken groom...Kourtney doesn't want her kids to have a drunk dad. She's read up on how it affects kids for the rest of their lives, so she wants to stop this before it gets out of hand."

Just days before the Yeezus concert, Disick was spotted pouring vodka shots from a balcony over college students at University of Arizona, where Kardashian went to school.

One source described the scene as "complete chaos."

Disick's actions that night sparked rumors that his attempt to drink in order to grieve his mother's death has gone too far.