who are the masked singers who have been revealed?
['Dionne Warwick was the Mouse (Image: GETTY/FOX) Week Five: Dionne Warwick - Mouse. ... ', 'The Taco has been unmasked on The Masked Singer (Image: GETTY/FOX) Week Six: Taco - Tom Bergeron. ... ', 'Week Seven: Bear - Sarah Palin (Image: FOX/GETTY) Week Seven: Bear - Sarah Palin. ... ', 'The Swan was revealed to be Bella Thorne (Image: GETTY)']