Ryan Phillippe's Ex-Girlfriend Alexis Knapp Pregnant With His Baby?

Ryan Phillippe may be currently dating Amanda Seyfried, but he might still be tied to his ex-girlfriend Alexis Knapp. The 26-year-old model/actress is reportedly pregnant with Ryan's baby!

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Ryan, 36, already has two children — Ava, 11, Deacon, 7 — with his ex-wife Reese Witherspoon, but he may become a father again.

Alexis and Ryan dated on and off last year for several months before splitting in September.

"She's in the second trimester," a source close to Alexis tells OK!. "Alexis has told friends that the child is Ryan's."

"Ryan doesn't know if he is the father and will want a paternity test," a second source close to the star explains to OK!. "He will take full responsibility for the child if he is, in fact, the father."

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The baby is reportedly due in June.

The news of Ryan's ex-girlfriend's secret pregnancy may explain the tension between him and Amanda the The Lincoln Lawyer premiere after-party.

According to the New York Daily New's Gatecrasher, Amanda left the party by herself and looked upset.

Ryan reportedly wanted to stay and hang out with his co-star Matthew McConaughey rather than pay attention to Amanda.