Reese Witherspoon took her son Deacon out to grab a bite to eat in LA on Sunday. Reese smiled and held Deacon's hand as they made their way into the Belwood Bakery and Cafe in Brentwood. Reese's food run wasn't the only item on her agenda for the day: she was also spotted filling up her car with gas at a local service station. While Reese was in LA, her Mud costar Matthew McConaughey was busy premiering their new film at the Sundance Film Festival. At the event, Matthew opened up about his longtime friend Lance Armstrong's recent confession to doping, which he said made him "pissed off." Fans of Reese and Matthew can get a sneak peek of the film by watching the new Mud trailer, which was released last week.