I've no idea whether Horner had already dumped his wife when he decided to get together with Geri, it's none of my business.
But, in the circumstances, with a devastated ex and upset parents, having a grand wedding with fanfare and full media coverage is insensitive and in poor taste.
If it were me I'd go off and do it somewhere quietly.
Mind you I wouldn't shack up with man who would dump a wife + baby.