Ryan Phillippe and Amanda SeyfriedAmanda Seyfried and Ryan Phillippe have ended their three-month romance.

Sources tell UsMagazine.com, "They are not dating anymore. And it's not a big deal for either of them."

Another insider was quoted saying, "At one point, there was a chance it would develop into something more serious, but it never did."

Rumors of the pair splitting up started when Phillippe was seen trying to hit on singer Rihanna at a pre-Grammy party on Feb. 11.