The sister of North Korean leader Kim Jong-un told officials in the South that she was pregnant during a recent visit to the Winter Olympics, South Korean media report.
There has been no confirmation from the South of Kim Yo-jong's reported comments, which are attributed to unnamed government sources.
But the intense speculation highlights the fascination with the North's opaque power structures and whether or not Ms Kim is indeed expecting shows just how little is known about the North's ruling dynasty.