Mischa Barton finally has a job as an actress now — yet she’s already acting like prima donna on the New York set of her CW show The Beautiful Life.

“She was getting snippy with the director and kept demanding that someone make instant coffee for her,” a source tells the New York Post. “Often, she’ll stare at the coffee for minutes at a time and say, ‘Who will fix my coffee? I need someone to fix my coffee.’”

Not surprsingly, a rep for Miss Barton had no comment. And considering the awful reviews of Mischa’s new show, her diva days may be limited.

Meanwhile, Mischa insists she hasn’t lost her marbles.

“I’m getting sick of answering questions about it,” the troubled starlet has been quoted as saying. “I just had a bad time of year and now it’s all over and done with, and I’m just very happy to be feeling happy again and back on top of it and not so worried about everything. It was just too much to handle for me at the time. One stay in the hospital was turned into this huge ‘She’s lost her marbles!’ thing, and people look at me like I’m unstable and they should probably cross the street when they see me.”