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Uh-oh! Does this mean there's trouble in paradise?

Nah - but Hugh Hefner's relationship is getting "more serious" with Crystal Harris, so the 20-year-old Shannon twins are moving out of the Playboy mansion and into the Playmate house, reports E! News.

Hugh says about the twins: "They've been hanging out with a lot of the other Playmates, and they see these girls traveling across the country to do promotion. They would like to be doing that, too."

But don't worry, this won't affect The Girls Next Door show! That being said, it looks like The Hef is becoming a one-woman man. Finally!