have been separated for six years.The “Mamma Mia!” star has been close with Mitchell for years, with Streep even honoring Mitchell during Grammy weekend last year.MusiCares gave Mitchell the Person of the Year award and Streep sent her a loving video message to applaud the accomplishment at the time. “I don’t know how you do what you do, I just know I need it like food,” Streep said in the tribute. “Ever since we were both young girls.