I am giving everyone in my Wedding Party a +1, because I want them all to have fun. Well, one of my bridesmaids informed me she plans on bringing this friend of hers to my wedding as her +1 who I am not too fond of.
A) She is good friends with an ex boyfriend of mine and always brings him up around me.

She gets sloppy drunk and is incredibly inappropriate (IE hits on my fiance, is flat out rude to my Bridesmaid's friends who she doesn't know, makes racist "jokes" which I do not find funny ever)
C) She is just very negative all the time. Everytime she comes out with my friend she finds an excuse to leave, and since my friend always drives (due to +1's said sloppy drunkness) she has to leave too.
I know I can no way dictate who my bridesmaids bring as their +1, so how do I deal with this girl on the wedding day?