Actors Ashton Kutcher and Mila Kunis attend the 7th Annual Chrysalis Butterfly Ball at a private residence on May 31, 2008 in Los Angeles, California. Credit: Eric Charbonneau/

Friends with Benefits meets No Strings Attached, starring Mila Kunis and Ashton Kutcher? Not so much.

On Monday, X17 claimed that the former That '70s Show costars were dating after Kunis, 28, and Kutcher, 34, were photographed hanging out together Sunday -- shopping for furniture and heading into Kutcher's new Hollywood Hills home.

"No! They're so not dating," Kunis' rep tells Us Weekly, explaining that the twosome recently reunited to film a That '70s Show reunion episode. "They've been friends for years." Pointing out that  "three other people" joined Kunis and Kutcher for dinner on Sunday, her rep adds, "Definitely nothing going on there."

A source close to Kunis agrees that the actress wouldn't think about going there with her longtime pal: "She would never ever," the insider shares.

Since his high-profile split from Demi Moore after six years of marriage last November, Kutcher has been romantically linked to screenwriter pal Lorene Scafaria, with whom he spent the Christmas holiday in Italy.

Black Swan star Kunis has been single since her late 2010 split from Macauley Culkin, her boyfriend of eight years.