Wedding Spirit

Michelle Gold sent us her wedding picture that may show a spirit being present with them that day:
"When I was seventeen years old, I had and experience of seeing and angel. Years later, I was told by an elderly lady that I had a gaurdian angel with me most of the time.  In 1997, I was married on the 6th of September.  Although I was thinking of members of the family that I wished could be with me on my day, I never sighted anything. But recently I noticed this picture among some old photos."

Someone was present with them at the wedding. Were loved ones from the other side standing with them and over them during the service? The mist-like appearance is not light from a spotlight above them. So, if not paranormal in nature, what caused the anomaly?