Katy Perry's pearl jewelry and green off-the-shoulder gown from American Idol

Katy Perry Instagrammed THIS VIDEO from American Idol.

Buy the exact same outfit here:

Her earrings are the Vivienne Westwood Pearl Drop Earrings. Buy them HERE!

Her necklace is the Vivienne Westwood Giant Pearl Drop Necklace. Buy it HERE!

Her dress is the Vivienne Westwood Off-shoulder satin gown. Buy it HERE!

Get the look for less here:

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