Adding fuel to the fire is the fact that Lopez has decided to drop greasy foods like burgers, as well as booze, for the launch party of Brave, her new album, at trendy Amika club in Kensington, West London.
Instead, as an insider revealed, the Latina has asked that healthy foods like a vegetable platter, sunflower seeds, and caffeine-free coke be served up.
"She has ditched the mini burgers and fries for a giant vegetable platter, sunflower seeds, caffeine-free coke and high-energy drinks," the Mirror quoted the source, as saying.
If the reports of a pregnancy are true, then JLo and hubby Marc Anthony will soon be on diaper duty.
While Anthony is already dad to three kids - a daughter Arianna, and sons Cristian and Ryan - this will be the first baby for Lopez.