Let us divide this problem into cases.
a. the bride must be in the picture
Where "X" stands for any other person. And "B" stands for bride. We will find the number of such cases and then add all of them up together.
In the first case there are . Similarly in each case we have the same number of arrangements. So in total we have .
Again divide this into cases. Case 1 is that bride is in picture and groom is not. Case 2 is that bride is not in picture and groom is. Then add those results together. Each subcase is similar to the problem just did above.
b. exactly one of the bride and the groom is in the picture