After sending the rumour mills into overdrive with an eye-catching diamond ring at the Avatar: Fire and Ash premiere in Los Angeles, Miley Cyrus has finally put all speculation to rest. The pop star has confirmed that she is engaged to her longtime partner Maxx Morando after four years of dating. Miley Cyrus and Maxx Morando recently attended the premiere of Disney’s Avatar: Fire and Ash at the Dolby theatre in Hollywood, California. (Photo by VALERIE MACON / AFP)(AFP) Miley Cyrus confirms engagement to Maxx Morando The news of Miley, 33, getting engaged to the musician was confirmed by several portals including Page Six and People. The couple sparked engagement rumours when they walked the red carpet together for the world premiere of Avatar: Fire and Ash on Monday in Los Angeles. Her song Dream As One is featured in the movie. Miley, 33, and Maxx, 27, posed for pictures together on the red carpet with the singer flaunting her diamond ring on her left-hand ring finger. The ring which is set in a thick …