irey-haired Paramore frontwoman Hayley Williams is Cosmo's latest cover girl. The photogenic, pint-sized pop rocker sports a sassy strapless blue polka-dot dress for the mag's May issue (which hits stands April 12th). Inside, the "In The Mourning" singer opens up about being bullied in school, her band's regrouping and being completely comfortable in her own skin. Check out the Grammy nominee's spring spread and tell us which ensemble Hayley rocked the hardest.