Sarah Jessica Parker Battles the Cold in Uggs

Sarah Jessica Parker tried her best to hail a cab while freezing on set of I Don't Know How She Does It in Boston yesterday. While filming, she was bundled up against the cold in business attire, but later she took a lunch break in a comfy sweatsuit and Ugg boots!

OK! GALLERY: SARAH JESSICA PARKER & CHRISTINA HENDRICKS HEAD NORTH TO FILM 'I DON'T KNOW HOW SHE DOES IT'

Sarah must have worked up an appetite after shooting all morning – she left the food tent with two plates!

OK! GALLERY: SMILES ON THE SNOWY SET OF LATEST FLICK

In addition to filming I Don't Know How She Does It, Sarah's been busy filming New Year's Eve in NYC. With a jam packed schedule like that, we don't blame her for taking some much needed downtime between shooting!