R+B singer NE-YO volunteered to be the father of a baby boy an ex-girlfriend conceived with another man when the biological dad failed to stick around. The kind-hearted star, 24, is no longer romantically involved with baby Chimere's mother but is determined the child will grow up with a father figure. He says, "My son is not biologically mine, but he's had no father but me since the day he was born."