entertainment outlet radaronline said this, a shocking conversation purportedly between gibson and his girlfriend, the mother of his girlfriend. >> reporter: cnn cannot independently validate the voice is actually gibson's and the actor's reps have neither confirmed nor denied the tape's existence or authenticity. his bu publicist they can't comment. but the voice sounds like gibsons and her publicist tells cnn the female voice is, in fact, hers. the publicist also tells cnn is transcript of the conversation on radaronline is ak crate but that she did not provide the tape to the media and doesn't know how radaronline obtained it