The source also claimed that Wedding crashers the star "did not contact Varunie at all" during pregnancy or after delivery. The pair were about five years old.
He allegedly took a paternity test in June when he was informed of the Vongsvirate pregnancy.
Documents received from US Weekly at that time, found that "the alleged father is not excluded as the biological father of the fetus."
Wilson remains an active parent of his two young sons, Robert and Finn, both of whom were born of various relationships.
Meanwhile, Vongsvirates shares the photos of the newly-born Lyla on the social media, which bears Wilson's surname and "looks like" according to his source.
The representative of the actress said Us Weekly, "this is a private matter, and it is not appropriate to comment further".