Am I being unreasonable?

My best friend wants to go to a party tonight that we weren't invited to. Her boyfriend was though, but the host of the party asked that the party stayed laid-back and no one brought anyone without asking first. My bff thinks it would be a great idea for me, MY boyfriend, and her to all get brought to the party by her bf. I'm friends with the host but she isn't and neither is my bf. I'm also not really friends with any of the people going and I would just feel so out of place.