Emmy Rossum Welcomes New 'Shameless' Co-Star Dermot Mulroney in the Best Way Ever

Emmy Rossum pairs her cute white dress with a bright red bag while running some errands on Wednesday afternoon (July 16) in Beverly Hills, Calif. According to Deadline, the 27-year-old actress just gained a new co-star! That’s right, Dermot Mulroney has officially joined the cast of Shameless for the upcoming fifth season in a season-long