Source: E!; Credit: eff Schear/Getty Images; Credit: Jonathan Daniel / Getty Images

Was Kourtney Kardashian way out of line for this one? The Keeping Up with the Kardashians star was spotted partying with little sis Khloe Kardashian’s ex until around 2:30 a.m. — and apparently things were heating up between the eldest Kardashian sister and the younger’s former flame!

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