Knapp was recently seen in Hollywood with an obvious baby bump.
“She’s in the second trimester,” a source confirms to UsMagazine.com.
The woman dated Phillippe on and off for several months last year. The actor ended the relationship in September.
“She has been telling people he is the father,” explains another source to Us. “Ryan doesn’t know if he is the dad. If he is, he will take full responsibility for the child.”
“He and Alexis were actually together for a while…It was pretty serious. He’s a good guy,” adds a third insider. “He loves being a dad and takes being a dad really seriously.”
Phillippe and Witherspoon are the parents of Ava, 11, and Deacon, 7.
The actor is currently dating Amanda Seyfried.
On the big screen, we can see Knapp in the movies “Project X” and “So Undercover,” a comedy starring Miley Cyrus.