We weren't shocked with the singer's wardrobe choice, since she usually leans towards the super-daring. However, we were surprised to hear the source of her outfit inspiration last night – Priscilla Presley in the '70s.
Long, flowy dresses, big hair ("The bigger the hair, the closer to God," Presley famously said), and keyhole necklines were certainly part of the actress' wardrobe repertoire, so we can see where Katy got her inspiration from. Click through the gallery to see some of our favorite '70s images of Priscilla Presley, and see how Katy's interpretation stacks up to the real deal.
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Photo Credit: Getty Images