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How Ryan Phillippe’s Ex Blindsided Him About Pregnancy

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Um, surprise?

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!

Related: PHOTOS: Who else is expecting in Hollywood?

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.)

Related: PHOTOS: Star dads share personal baby pix

As 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."

PHOTOS: Ryan and other Hollywood hunks — shirtless!

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."

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