Here come the waterworks -- TMZ has obtained video of Jennifer Lopez tearing up on stage Saturday night in Connecticut ... moments after she performed the song "Until It Beats No More."
The video kicks in right after Lopez -- who split from hubby #3 Marc Anthony in July -- finished up the performance.
Lopez had introduced the song by saying, "I'm going to sing you the last song I wrote about love ... a lot has changed since then."
Whoever was cutting those onions in the crowd should be ashamed of himself.
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