Miley Cyrus made a fiery red carpet appearance at the Avatar: Fire and Ash world premiere with boyfriend Maxx Morando - and the duo sparked speculation that they've taken the next step in their relationship. Cyrus, 33, cozied up to Morando on the red carpet at the Dolby Theatre in Hollywood on Monday, December 1, wearing a sparkly black mermaid dress. Morando, 27, wore a black suit and a white shirt for the premiere. Cyrus' choice of jewelry, however, is what caused the most commotion, as she wore what appeared to be a diamond ring on her left ring finger.