Zombie and all but I recently read Billy Idol’s autobiography and he talks about this song and making the video for it. It is indeed about his sister’s wedding, I’ll see if I can find the paragraph and quote it if folks are interested. Nothing to do with anything awful (e.g. incest, white power, etc) as some have suggested.
The bride in the video is played by Idol’s g/f at the time (Perri Lister), a professional dancer and mother of his son Willem. She’s one of the girls smacking their own butts in time to the music. As a young lad I most definitely enjoyed the video 