Remember the days when Mischa Barton was a rising star with a lead stint on the popular teen show The O.C.? Well, those days are long gone. Now, she can barely handle a mere guest spot on Law & Order: SVU, according to reports. Co-stars are describing her behavior on the set as downright criminal. Okay, maybe it's not that bad -- but it's pretty darn close. Insiders are telling Radaronline.com that the troubled actress who did time in a psychiatric facility last year appeared to be suffering from some sort of short-term memory loss that led to a whole lot of wasted time for cast and crew on the hit NBC crime show. In fact, because of Barton's inadequacies it took an entire day to shoot one scene. The source confided to Radaronline.com that Barton was far from the consummate professional, saying, "She only had seven lines, seven! Each time she would mess up she would forget her lines and Mariska [Hargitay] kept prompting her and saying 'It's your line, Mischa.' On a positive note, the hot mess did apologize each time she missed a line and she did look "pretty." The source adds that when the long day was done, Barton scooped up her little dog and "ran to her trailer." It sounds like Barton is one missed line away from accepting reality television show offers.