By Charlotte Tutton The Masked Singer fans ‘know’ exactly who Piranha is on the ITV series after the latest episode. Air Fryer, Bubble Tea, Owl, Piranha and Eiffel Tower were the five costumes battling it out on the show on Saturday night, as they took on school disco week. But as Piranha delivered another epic performance and gave away some big clues, some fans were convinced they had revealed their identity on the show. Davina McCall, Jonathan Ross and Mo Gilligan were back on the panel, this week joined by actress and comedian Jennifer Saunders, with panellist Rita Ora missing again. As Pir…