Hugh Hefner, 82, cannot live by twins alone, oh no, so meet his latest addition to the Playboy family, Ms. Crystal Harris.

Harris, 22, has been seen by Hef and the twins’ side at events and in numerous photographs, but was clearly overshadowed by the younger, wilder, Shannon twins, Karissa and Kristina.

Crystal claims that Hef has given her “the go” on publicly announcing that she is the third wheel girlfriend of the Playboy mogul’s. She says, “Hef gave me permission to fill people in on the new updates as a voice from the mansion.”

A voice? So that’s what they call it these days..

Crystal also wants everyone to think that she is a sweet, young thing. And even goes as far as to call herself “a good girl” on her MySpace page.

Last I checked, “good girls” don’t sleep with billionaire 82-year-old’s for money and fame…gah.

The former Co-ed of the Week on Playboy.com also bestows us with other vast pearls of knowledge such as, “I believe in opening your heart and letting your walls down, it is better to have loved and lost, than to never have loved at all.”

Walls = legs, right?