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The singer, who is expecting a baby with husband Marc Anthony, said her hormones get the better of her when she sees a sentimental advert.
Now quotes her as saying: ''Anything that is touching makes me cry - any commercial that is sappy and silly. Things about dads make me cry, maybe because of my relationship with my own father.
"But anytime I see anything about a dad with his little girl, and I'm over tired, I'm gone!"
Lopez announced her pregnancy in November after weeks of speculation. It was recently rumoured that she is expecting twins.
