Mila Kunis is not to blame for the breakup of Justin Timberlake and Jessica Biel, despite rumors suggesting she is, a source told People.com.

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Timberlake and Biel last week announced they had ended their four-year romance.

Timberlake and Kunis co-star in the upcoming film, "Friends with Benefits." They also were both on the awards-show circuit this past season for their respective movies, "The Social Network" and "Black Swan."

"Mila had nothing to do with their break-up," the source said. "In fact, no one came between them. They decided their relationship ran its course and it was time to move on."

The insider went on to emphasize Kunis and Timberlake are "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," the source told People.com.