When pregnant actress Alexis Knapp announced that she was carrying Ryan Phillippe's child at a Hollywood bash in mid-February, it was a complete shock to everyone -- including the alleged dad-to-be!
A source tells the new Us Weekly that Phillippe (who wasn't present at the bash) was blindsided when he heard second-hand about Knapp's very public bombshell. "Alexis hadn't even talked to Ryan before that party," a second source says. (Counters an insider close to the So Undercover actress, who is due in June: "Ryan found out as soon as Alexis did.)
As UsMagazine.com first reported on Monday, the Lincoln Lawyer actor, 36, "doesn't know if he's the father," the first source says, but plans to take a paternity test. (He and Knapp dated on and off for several months before calling it quits in September 2010.)
"If it's his, he'll take responsibility."
One gal in his corner? His ex-wife and mom to his children, Reese Witherspoon!
"Reese has been really supportive," the first source says. "She knows that Ryan is a good dad [to Ava, 11, and Deacon, 7] and she respects that."