But now it looks as though we were right all along - because the bride had a secret second wedding dress...
While we sat for a while, wondering what this meant, an answer came via Twitter from the new Mrs Cooper herself.
"I wore my BEAUTIFUL Chanel dress to our reception," she clarified.
Mystery solved! But now we're really wishing there was a full-length photo. Doesn't it look beautiful?
What do you make of Lily's secret second wedding dress? Let us know below!
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