Back of January Starts Filming For Mad Men's Season Premiere in July! January Jones was all dressed up as Betty Draper on the Mad Men set in Pasadena on Monday. January has been going about her routine around her Los Feliz home and hanging with friends in the past few weeks, but she got right back into character once she slipped on her '60s dress. Her costar Jon Hamm started shooting last week and while we don't know what's in store for the onscreen couple, we did get the return date for the series — the fourth season will kick off July 25! View 5 Photos › Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Comments amybdk 7 years July?!?! That's sooner than usual, no?