Jennifer Lopez in a Gown Shooting Music Video Pictures

Jennifer Lopez had yet another costume change on the set of her music video shoot in downtown LA yesterday. It's the third day in a row she's been working on the project, and this time she wore a dramatic green gown, which is a change of pace from the tight leather pants and midriff-baring top she sported previously. The wind and high slit in her billowy dress gave onlookers a peek at her Spanx, showing that even superstars with amazing bikini bodies like Jennifer Lopez want to keep everything smoothed out sometimes. On Sunday and Monday JLo had Max and Emme as visitors at work; though, yesterday the cute twins weren't in her arms as she showed off her moves with another elaborate dance number.