First, I wanted to thank you all for the advice you've already given me! I really appreciate it.
When we originally were planning the wedding, I envisioned 150 people max. As of today, our guest list is at 161. The other day, my mom, FMIL and FSIL went to lunch after dress shopping. I reminded FMIL that we still needed a couple addresses. She commented that she also had a couple more names to give me (some sort of cousin). My mom and I didn't say anything then, and perhaps we should have. My mom called me and is very concerned that the number keeps increasing. Since she is paying for it, I completely understand. I need to tell FMIL that the guest list is full and am not sure how to do that. Our guest list is very lopsided towards FI's family and family friends, so while I don't feel bad, I still want to handle this with as much tact as possible. I have mentioned multiple times that our limit was 150 in front of FMIL, and have also mentioned that we were at limit. We have already sent out STD's (except for the people I don't have addresses for yet). Should I have FI talk to her? I just don't want her to be offended. Blah.