Mariska Hargitay spoke on the red carpet at the Screen Actors Guild awards tonight about Mischa Barton, who guest stars on Law and Order: SVU in an upcoming episode. The two ladies worked together for a couple weeks on the set, and Mariska was very complimentary. Mariska said about the former O.C. star, who was rumored to be unprofessional on the set of the NBC series: “[She is] an amazing professional,” Mariska told Access Hollywood on the red carpet. “Lovely to work with. She does good work.” Then, she turned to the cameras and reportedly yelled out: “The gossip is fiction!”