Recently I saw two interviews, one with Victoria Beckham, the other one with Elton John. They were talking about their past experiences and that's the phrasing they used:
But it wouldn't have happened if we HADN'T HAVE GONE to the Ukraine. (Elton)
And I probably would still be that way if I HADN'T HAVE MET the girls. (Victoria)
Is there any explanation behind the grammar written in capital letters?