Viper poses for a photograph as the titular "blushing bride" at her wedding, since, well, it is a big day for her after all; I'd be more surprised if she wasn't overcome with some kind of emotion on her own wedding day. X3
As for who exactly Viper is marrying however, I don't really know the answer to that question. All I know is that she's getting together with a giantess of some kind, but I don't know the specifics about it just yet.
Maybe you guys can pester kyurem2424 about it, since I imagine they'd know more about the situation then I do. =p