Back Up Plan Lopez

Usually it's Aniston on the set of The Baster, but yesterday we snapped Jennifer Lopez on the Hollywood set of The Back-Up Plan, and Max and Emme's mama was looking super sexy in this flowy teal dress. The flick is about a woman "who conceives twins through artificial insemination, only to meet the man of her dreams on the very same day."

Hmmm, sounds sorta like that film the other Jen is working on...then again, the twins part makes it different, right? And J. Lo knows all about that, so we're guessing that's why she picked this role!