This is precisely why wedding photographers should have these 2 points in their contract:
1. Title/ Ownership belongs solely to the photographer. w/o this clause, copyright is by default the client's.
2. Define what are your rights /power over the images. Make it clear that you use it for your own advertising (website, blog), monetise some of the images (in the case of images with the client's face, you'll need to get a model release from them). This is to safeguard yourself and not having any baggage when you post or publish any of your work.