Can you believe it! "gate Crashers" problems

WOW I can honestly say the most annoying, stressful part of wedding planning is PEOPLE, the uninvited guest specifically. Let me tell ya'll how one of my guest asked me last minute (yesterday) if two people who I would be meeting for the first time at my wedding can come, because they want to join them for the road trip to my city, I said NO, my wedding is 16 days away, RSVP deadline been passed, and i've been done with the guestlist, already confirmed with the venue, and damn near fed up with all this wedding planning. She had the nerve to text me today and say that the uninvited guest were planning on coming anyways to my wedding as GATE CRASHERS. I had to even google what gate crasher meant, because the text was so nonchalant. I'm so rattled that people can HONESTLY think that this is okay! I'M SO ANNOYED by this and I'm not trying to be stressed out so close to my wedding date. But seriously, I can't understand this. All I can say is that they are going to be AWFULLY disappointed when they are not welcomed by me, after I've already expressed myself nicely because I am NOT accepting "gate crashers". I am completely baffled at this type of human behaviour, like I really can't believe it. Some people truly have no sense! "I'M UPSET" *Drake Voice LOL* no but seriously has this ever happened to anyone?????? (sorry for my rambling, i'm very emotional right now lol)