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Ryan Phillippe signed autographs outside of Jimmy Kimmel Live last night, and the sexy Lincoln Lawyer actor dodged questions about ex-girlfriend Alexis Knapp's pregnancy.

Knapp and Phillippe hooked up last summer, and the model/actress is now 7 months pregnant. The timeline certainly makes sense, but neither of the stars has confirmed that Phillippe is the father. "Ryan doesn't know if he is the dad," an insider told Us Weekly. "If he is, he will take full responsibility for the child."