Jennifer Lopez: "Baby Bump Watch"

Jennifer Lopez has been very busy filming The Back-Up Plan all over the LA area and on Thursday (June 18) she was back in Pasadena, California.

Earlier this week, the 39-year-old wore a prosthetic pregnancy belly for her role in The Back-Up Plan. Just 16 months ago she gave birth to fraternal twins Max and Emme.

Jen has been bringing her children to work with her and has been busy trying to put out two albums this year.

15+ pictures inside of Jennifer Lopez‘s baby bump watch…