On March 5th, 2008, Alaska's Republican Governor, Sarah Palin, announced to the media that she was 7 months pregnant with her 5th child. She is currently 44.
The controversy arises from two sources: First, Palin does not appear pregnant in any recent photographs. The announcement came as quite a shock to people who had worked closely with her, and have been quoted as saying that she did not appear pregnant whatsoever during the prior 7 months. While this is debatable, you can judge for yourself here: http://gov.state.ak.us/photos.php
Second, Palin's daughter Bristol is 16 and attends an Anchorage high school. Students who have attended class with her report that she has been out of school for months, claiming a prolonged case of mono.