Kardashian Sisters Not Baring All ... Yet

03/18/2009 at 04:00 PM EDT

For now, it's keeping it on with the Kardashians.

The three TV reality star sisters – Kim, 28; Khloe, 24; and Kourtney, 29 – will not be appearing nude together in a spread in Playboy.

"Although we would be flattered," blogs Kim, "no one has even asked us, so I don't know where this rumor has sparked from."

Of course, Kim has already disrobed for Playboy's December 2007 issue, and she does see the benefits of making it a family affair.

"We would be the brunette version of The Girls Next Door!" she writes. "Haha." – Mike Fleeman