So towards the end of the reception MIL pulls me aside to meet her friend Kim. I am very gracious and thank her for coming, all the while thinking, "who the hell is Kim, there was no Kim on the guest list". I also am thinking yhat there is something weird and untrustworthy about this woman.
I mention this to DH later and he was also confused by it. So he asked his mom about it and it turns out that since 2 of her friends were unable to come to the wedding due to illness (they told her the day before), she just went ahead and in invited this random woman Kim, and never told me or DH.
DH told her that it was totally inappropriate for her to be inviting people, and that it was really tacky that she would call someone and be like "hey, want to come to my son's wedding tomorrow?". He also mentioned that it was gross that Kim would accept a last minute invitation to a wedding when she obviously wasn't on the guest list to begin with.
To all of this MIL responded, "what's the big deal, she came after dinner". Ugh, gross.