Amanda Seyfried is notoriously private when it comes to her children, so when she posted an extremely rare photo of her holding her baby - it was for a chilling reason.The Mamma Mia actress took to her Instagram Stories and posted an otherwise beautiful snap of herself with her baby Thomas snuggled up to her with their family dog alongside them.However, the idyllic photo is disturbed by an image emerging in the background of the photo.SEE: Amanda Seyfried shares rare glimpse of baby son inside