After Mila Kunis was spotted hanging with her former "That '70s Show" co-star Ashton Kutcher several times over the weekend, the rumor mill began to spin that the one-time onscreen couple began dating in real life. Well, her rep is addressing the rumors and shutting them down. "They've been friends for years, and they had dinner with a bunch of friends," the rep told Celebuzz. "They're not dating." The rep continued to Usmagazine.com that there's "definitely nothing going on there" and that "three other people" were with the twosome when they went out to dinner. According to People.com, those other friends included "70s" co-stars Wilmer Valderrama and Laura Prepon. The former castmates will all be on hand this Sunday during Fox's 25th Anniversary special. The friends without benefits were spotted furniture shopping and chowing down at a sushi joint for dinner in Studio City, California, over the weekend. They also were seen later hanging out at his L.A.-area bachelor pad. Adding fuel to the dating-rumor fire was the fact that Kunis tried to hide from photogs by riding in the backseat of his car. "Ashton was touching Mila's hand, and Mila was all dressed up," observed an X17 Online photographer who saw Kutcher and Kunis at the Japanese restaurant Asanebo. Whether or not the "Two and a Half Men" star is dating Kunis, it seems his dance card has been quite full lately. Kutcher's also been romantically linked to Rihanna, who later denied anything was happening between them, telling reporters, "I'm happy, and I'm single."