It’s hardly a “diva moment,” even though that’s how she jokingly refers to herself. Yet if one uses “diva” in its original and laudatory definition—“a glamorous woman who is pre-eminent in her field”—then Headley is a diva of the highest degree. After all, she won a Tony Award for her show-stealing outing in the title role of Broadway’s Aida in 2000, then added a Grammy Award to her trophy case in 2010 for her gospel album Audience of One.