who has been unmasked on the masked singer list?
['Robot (Lil Wayne) Source: FOX. ... ', 'Llama (Drew Carey) Source: FOX, Getty Images. ... ', 'Miss Monster (Chaka Khan) Source: FOX, Getty Images. ... ', 'Elephant (Tony Hawk) Source: FOX, Getty Images. ... ', 'Mouse (Dionne Warwick) ... ', 'Taco (Tom Bergeron) ... ', 'Bear (Sarah Palin) ... ', 'Swan (Bella Thorne)']