Reality TV star Kourtney Kardashian reportedly has broken up with her longtime partner Scott Disick, with whom she has three children.

E! News said Monday that Kardashian, 36, eldest of the four Kardashian siblings from E!'s "Keeping Up With the Kardashians," ended their nine-year relationship over the weekend. Citing sources, E! said the split came after a weekslong party binge by Disick, 32, originally of Eastport, and after photos surfaced Friday of him on a yacht in Monte Carlo with his arm around Los Angeles-based stylist Chloe Bartoli, whom Us Weekly identified as an ex-girlfriend. Kardashian and the children were with friends in Malibu, E! said.

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Disick has a history of alcohol abuse, which played out on the 2010 season of spinoff show "Kourtney & Kim Take Miami" -- in which the couple temporarily broke up over the issue, and the two attended counseling together -- and on last year's "Kourtney & Khloé Take the Hamptons," in which Disick entered Connecticut's Mountainside Treatment Center after a night of hard partying.

In October 2013, the only child of Bonnie and real estate developer Jeffrey Disick, lost his mother after a long illness. In January 2014, his father died suddenly of undisclosed causes. Disick said the ordeal had made him "hit rock bottom" in a June 2014 episode of "Keeping Up."

He checked himself into the Rythmia Life Advancement Center in Costa Rica in March, telling at the time, "I realize my issues are bigger than me and I'm ready to truly remedy this struggle I continue to battle."

The couple has three children: Sons Mason, 5, and Reign, nearly 7 months, who share a Dec. 14 birthday, and daughter Penelope, who turns 3 on Wednesday.

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A representative for Kardashian was not immediately available for comment. Neither she nor Disick have posted about the issue on social media.