The rocker admits they have to keep changing their plans to tie the knot because they can't come up with a permanent wedding date.
So now Crow and Armstrong are likely to get married on the spur of the moment.
She says, "Somewhere in between this small tour and doing a big tour, we're going to get married, and we would like to invite all of our fans, but we can't so we don't know what we're doing.
"We set a date and then we move it, we set a date and then move it. Now, we're just like, 'Let's run off, so I don't know."