Hayley Williams wore a Lip Service Be Nice-Or Go Away Double Sided Graphic Crop Tank ($33.00), a pair of Marc by Marc Jacobs Pinwheel Floral-Printed Silk Pants ($398.00), and a pair of UNIF Edge Platform Shoes in Pink Hologram ($155.00) during Paramore’s performance of “Ain’t It Fun” live on American Idol last night.