There's one rule at the Playboy Mansion: Always make sure Hugh Hefner has a fresh diaper on.

No, wait, it's this: never bring boys into your room!

Because both Karissa and Kristina Shannon violated this condition, the busty blondes have been ordered to move out of the iconic premises.

"After a couple of weeks, Hef was getting a little bit upset about the boyfriends, so he wanted us to move out," Karissa confirmed this week. "We were not allowed to have boys in the house. That was the absolute number one rule: no boys allowed."

Indeed, the Shannons have even been forced out of the Playboy House, where they were installed in January.

Hef says the trio is still on good terms, just not naked terms:

"They will now be friends, but they won't be defined as the girlfriends... They've been hanging out with a lot of the other Playmates and they see these girls travelling across the country to do promotion. They would like to be doing that, too."

Or, in the case of Kendra Wilkinson, doing Justin Frye on video.