We've spent all October thinking about trick-or-treating, dressing up, and spooky ghost stories — and now the occasion is finally here. It's Halloween weekend, and some of your favorite celebrities have already gotten in on the action! Justin Bieber, 5 Seconds of Summer, Little Mix, and a bunch of other stars are dressing up in some of the most creative costumes we've seen yet.

Click through to see what everyone is wearing today, then let us know in the comments below whose costume you love the most. What are you dressing up as today?

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