Ryan Phillippe is a dad again, according to reports.

The actor's ex-girlfriend, model Alexis Knapp, gave birth to a healthy baby girl on Friday, according to In Touch magazine.

Phillippe, who has a daughter and a son with ex-wife Reese Witherspoon, was by Knapp's bedside when little Kai was born at Cedars-Sinai Medical Center in Los Angeles.

The actor has yet to discover if he is officially the baby's biological father via a DNA test, but a source tells the publication, "He's acting like he is."

The Crash star, who recently split from actress girlfriend Amanda Seyfried, was photographed visiting Knapp's doctor with his ex last month.