Four major news agencies pulled down a picture of Kate Middleton this weekend over “serious concerns” that the picture was “manipulated,” RadarOnline.com can report. In a shocking development to come after Princess Kate appeared to resurface after undergoing abdominal surgery in January, a picture of the royal and her three children was abruptly pulled on Sunday. The photo, which showed Prince William’s wife and their children celebrating Mother’s Day in the United Kingdom, was ultimately pulled by the Associated Press, Getty Images, Reuters, and AFP shortly after it was shared by Kensington P…