I am wearing the Katy Perry California Gurls Costume. I thought of the idea myself. You will need the following: a blue wig at least 2 Silicone 2-Inch Reusable Baking Cups - they usually come in a pack of at least 6 - mine came with
Katy Perry-California Gurls v2 by cdanigc on deviantART
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Katy Perry California Gurls Costume