Katy’s red embellished one-shoulder dress on American Idol

Katy’s sequin striped dress on American Idol

Striped Sequined Mini Dress by Ashish at Net A Porter, $1970

Katy’s fringe drop earrings on American Idol

Fringe Drop Earrings by Atelier Swarovski at Bloomingdales, $499

Katy’s pink sandals on American Idol

Strass Sandals by Stella Luna at Shopbop, $598

Katy’s star earrings on American Idol

Crystal Star Clip-On Earrings by Kenneth Jay Lane at Lord & Taylor, $125

Katy Perry’s blue metallic trench coat on American Idol

Metallic Vinyl Trench Coat by Marc Jacobs at My Theresa, $300 (was $501)