"The bikini waxing, after we go there you can't turn back," Khloe said.
The sisters may be light-hearted about their on-screen exploits, but when it comes to building and protecting the Kardashian brand, they are all business.
Last month, Kim sued Old Navy over a commercial featuring a look-alike of her. Old Navy's parent company, The Gap, hasn't commented on the lawsuit.
"I think that when there's confusion out there and people might mistake me for working for another company ... it was just, I think, a smart business decision to make sure that no one confuses me with anyone else other than ... my own clothing lines," Kim said.
Asked what her late father -- noted attorney Robert Kardashian -- would have thought of his daughters' success, Kourtney said: "I think he would be so proud, because he was such a strong businessman, so I think that he would love all of our business sense and, that we got from him."
Kim added that he would also be proud "that we work really hard and that, you know, we've still kept family as our number one priority."
That family keeps on growing.
The latest "K" to join the family is New Jersey Nets star Kris Humphries. He gave Kim a blinding, $2 million, 20 ½ carat diamond engagement ring. The two are set to wed on Aug. 20, and the wedding will be broadcast on E! as a special.
Kim, who describes herself as "truly a workaholic," has been balancing wedding preparations with her work.
The Kardashian sisters say they are not the party girls they once were.
They are now wives, mothers and brides-to-be, but above all, businesswomen building an incredible empire.