The Prince and Princess of Wales released a photo of Catherine with their three children George, Charlotte, and Louis on Sunday to mark Mother's Day in the U.K. The image was heavily scrutinised online, with social media users claiming that it had been digitally manipulated and several news agencies subsequently pulled the photo over questions about its authenticity. Catherine, 42, admitted she edited the snap in a statement on the couple's social media accounts on Monday. "Like many amateur photographers, I do occasionally experiment with editing…”