We let one of my BM's to transfer her invite from her BF to her friend. Now, thinking about everything my mom and I thought it would be kind of weird to let her friend come to the rehearsal dinner. I know the friend but wouldn't have considered inviting her to the wedding in the first place and definitely not the rehearsal.
I mean, it's not really fair to other people in the wedding party who weren't allowed to bring a friend because they were invited as singles because they are singles. I think it's like rubbing it in their faces that the one BM gets to bring a friend and no one else especially to the rehearsal that FI's parents are paying for and had a cow originally about the size of the dinner guest list.
Would you let the friend come to the dinner? I'm starting to wish we had nipped this in the butt from the get go and told her no because now she's trying to convince me to let her BF come as well... ugh.