Britney Spears has called out Christina Aguilera for apparently failing to speak up about the mistreatment the "Toxic" singer faced in her conservatorship. On Friday, Spears shared a clip on her Instagram Story of Aguilera, 40, answering questions on the red carpet for Thursday's Latin Grammy Awards.The short video shows Aguilera being asked by a reporter if she's had any communication with Spears, 39.