Taking another girl as a plus one to a wedding?

Cosytoasty
I've got a wedding coming up and my girlfriend is going to be abroad for work so she can't attend. I'm thinking of taking one of my (our) close friends as a plus one.

It just seems like it would be SO awkward to show up alone because virtually everyone there will be couples or the singletons invited with guests. I know platonic friends go to weddings together, but i'm not sure what the etiquette is if i'm actually in a relationship.
Taking another girl as a plus one to a wedding?
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