This photo is from The Best of Martha Stewart Weddings. I received this book as a Christmas gift a good 13 years ago or so. And I still love gazing through all of the pictures. It's a classic example of doing something timeless that will never go out of style. Gorgeous.
Who stands in the line? The wedding hosts head the line. If your parents are hosting, your mother would greet guests first, followed by your father, to her left; the groom's mother, then his father to her left; the bride; the groom; the maid of honor; and the bridesmaids. (It is optional for fathers and attendants to stand in the line; you may prefer that they circulate among guests.)