Princess Kate Middleton is shedding light on the truth about mental health in motherhood. The United Kingdom charity Maternal Mental Health Alliance (MMHA) took to Instagram on Friday, November 14, to share a letter written by the Princess of Wales, 43, about the importance of the organization's new exhibition, "This is Also Motherhood," which explores "the often unseen realities of mental health throughout pregnancy and beyond." "The Maternal Mental Health Alliance continues to champion the voices of those navigating perinatal mental illness," Kate wrote.