Source: Ryan Phillippe Shot Down By Rihanna

Ryan Phillippe and Amanda Seyfried, who have been a couple for a few months now, were spotted having an intense conversation the week before last.

This sparked rumors that the two are on the rocks, if not over for good, because days later, Phillippe was already on the prowl, trying to pick up Rihanna.

"He said something to the effect of, 'What are you doing tonight?' She said 'sleep,'" a source said. "She was polite, but she was genuinely not interested."

Fear not, Phillippe fans, because Reese Witherspoon's ex had more luck later that night, when he was seen leaving a house party with a pretty brunette.

As for his relationship with Amanda Seyfried?

"It's casual. They'e friends who hang out romantically from time to time and that's it," says a pal. "At one point, there was a chance it would develop into something more serious, but it never did. There's no commitment."

Just the way he likes it, we're guessing.