Hugh Hefner has always given unique meaning to the phrase "out with the old, in with the new."
After all, Girls Next Door stars Holly Madison, Kendra Wilkson and Bridget Marquardt are far from getting their AARP membership cards, but that doesn't seem to be stopping the Playboy mogul from trading them in for a couple of newer models—namely, 19-year-old twins Karissa and Kristina Shannon.
Though the parting does seem to be a mutual decision, what with Hef telling us "it's over" between him and Holly (due, in large part, to a low sperm count), Kendra dating footballer Hank Baskett, and Bridget wanting to spend more time focusing on her TV career.
Still, we're having a hard time imagining the Mansion without 'em, and we know it's gonna take us awhile to accept whoever fills their stilettos. But what do you think?