DISICK KEEPING UP, WITH KIM & KHLOE

And Kourtney can't stand it

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SELF-STYLED playboy Scott Disick is keeping up a naughty, flirty friendship with unofficial sisters-in-law Khloé and Kim Kardashian, and insiders say it's annoying the heck out of his baby mama, Kourtney, who's begging her sibs to cool it with her ex!

The 42-year-old Don Juan, who has a penchant for canoodling with women near half his age, was back to his old tricks as he goofed around with Kim, 45, on social media late last month.