Am I just being a brat?

Ashley
My boyfriend took it upon himself to invite one of his friends to my baby shower. Somebody I've never met before and he didn't even ask me if she could come. He TOLD me she was coming. And he expects me to just say okay and be all happy about it. He isn't even going to be at the shower so In my opinion that's just awkward for me. Is it wrong for me to say she shouldn't come? Or be upset he invited her without consulting me? I don't want to be a brat but I feel like it's really not fair. 

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