Where did you hear about this? I'm usually ontop of these things and haven't heard reports of that yet. Last I heard was that she broke down crying and ran off stage during her concert in Berlin. Some sources says she was pissed that she wasn't performing well, others say she was freaking out about possibly being pregnant by her boyfriend.
On a related note, rumor has it that J-Lo got married so fast because she's pregnant. Apparently she has no future work scheduled for the time being, plus she isn't showing any cleavage at all due to her increased bust which would make it obvious.
Important shit, folks.