Mila Kunis is behind Justin-Jessica break up?

Singer Justin Timberlake recently parted his ways with his girlfriend and actress Jessica Biel. Now it is being speculated that the reason behind their break up is his romantic link up with his co-star Mila Kunis, whom he met on the set of their upcoming film Friends With Benefits. Since then the couple have been 'flirting', which lead them to split up.

According to source, Justin Timberlake was very much interested in Kunis, 27, and they have great chemistry. "Justin is very interested in Mila. They've been flirting. But so far nothing has happened," the Daily Mail quoted a source as telling E! Online. His interest in her is said to have forced him to dump his long-term partner.

Another source said, "Mila had nothing to do with their break-up. In fact, no one came between them. They decided their relationship ran its course and it was time to move on." The source added, "They're not in a relationship. They star in a movie called Friends with Benefits, but they're just friends. That's it. They are not together."

However, celebrity blogger Perez Hilton heard from a source that the pair had been very "flirty" with each other on set, leading him to suggest that something may now happen between the two now that Timberlake is single again. Meanwhile, Kunis has split from Home Alone star Macaulay Culkin in January after an eight-year relationship.