Jennifer Garner Violet Seraphina Affleck Downtown Los Angeles

Out with the mom jeans and sneakers, and in with the skinny denim and high heels!

Either Ben Affleck took her on a major shopping spree at Barneys for the holidays, or Jennifer Garner asked stylist Rachel Zoe for some serious help -- we've never seen her so glammed up while out running errands with her girls!

On Saturday Jen and her girls were snapped out and about in downtown Los Angeles, and the 40-year-old actress showed off her slimmed down figure, along with a pricey new Prada clutch. Can't wait to see her on the red carpet at the Golden Globes next Sunday with her hubby -- that will be the real test to see if she's turned a new leaf when it comes to fashion!