Worst: Bikini Girl vs. Kara DioGuardi, Season 8
American Idol hopeful Katrina Darrell showed up to her Season 8 audition wearing nothing but a bikini — and packing an attitude. Dubbed "Bikini Girl," she and judge Kara DioGuardi got into a contentious sing-off when it came to Mariah Carey's "Vision of Love" — leading to the bathing-suit babe throwing some serious shade at the judges' table. Still, she earned a Golden Ticket, only to get cut during Hollywood Week. She resurfaced at the finale, where DioGuardi stooped to an embarrassing low (supposedly for "charity") by interrupting Darrell's performance to show off her vocal chops — and bod.