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Ryan Phillippe may be changing diapers again very soon!

The sexy father of two is expecting a baby with gorgeous model Alexis Knapp, according to Us. The couple briefly dated last summer, and just recently, Knapp revealed she's pregnant.

A source tells the mag:

    "Ryan doesn't know if he is the dad. If he is, he will take full responsibility for the child."


Phillippe is currently dating Red Riding Hood actress Amanda Seyfried. The 36-year-old actor has two children with Reese Witherspoon ... Ava, 11, and Deacon, 7.

Reps for Phillippe and Knapp have not returned our request for comment.

Find out which pop star will be working with Alexis in her next film ... after the jump.