OK, so I'm going to guess: She's Catholic, and so is TB, maybe she didn't want to "make a mockery out of her religion"? I know, there are probably 1000ds of things to bring up where she is not behaving like a devout Catholic, it's just a random guess. She's probably like most of humanity, wearing their badges of of pet agendas when it suits them to do so.
TB always looks awkward in suits in pics but he looks like he really loves his wife and is proud of her. Which is a good thing if your guy does. And he's holding his hand on her a*rse. Also, I think, generally a good thing