have left the cave. we'd still be -- somebody's got to go out there and look at what's across the river and over the hill. without, that you might as well just pack up and go home, and what kind of country are we living in anyway? >> dr. tyson, thank you so much. >> all right. >> thank you. the cake had been ordered, the menu selected and 300 invitations delivered, but in a last minute turn of events hugh hefner's wedding to a woman 60 years his junior has been abruptly cancelled just five days before he was due to tie the knot for the third time. the confirmation from hefner himself in the form of a tweet. it read the breakup is a heartbreaker, but better now than after the marriage. the heartbreaker indeed, but one that hasn't stopped the jilted hefner from taking a few last-minute jabs at his once bride to be. in another tweet he's written since we're not getting married on saturday, i've scheduled a movie, "runaway bride." seems appropriate. joining me now is a former girlfriend of mr. hefner, isabella st. james.