Misha Barton doesn’t seem to be using her “sober coach” anymore. The actress, who was given a chaperone to control her partying while working on her now-canceled show, “The Beautiful Life,” was at SoHo eatery Mexican Radio earlier this week with a group of friends, knocking back shots and drinking margaritas. “They all looked like they were having fun,” a source says. “She looked healthy and in control.”