'Rocketman' follows the transformation from shy piano prodigy Reginald Dwight into international superstar Elton John, out May 31.
The actor also dished on his upcoming film 'Rocketman' at the 76th Golden Globe Awards, airing Sunday on NBC.
The music legend cancelled the first show nearly half an hour after it was set to start.
Harry Styles, Beyonce and Gabrielle Union also decided to pay tribute to their favorite living legends this Halloween.
Plus, see how more celebs dressed up at Friday's Casamigos Halloween party.
ET was first on set of the upcoming biopic, in theaters May 2019.
The actor shows off his vocal talents while portraying the music icon in the teaser clip.
The upcoming biopic hits theater May 31, 2019!
ET's Kevin Frazier was on set of the top secret film slated to be released in May of 2019.
Romeo turns 16 on Saturday!
The music icon opens up about attending the May nuptials.
The 33-year-old royal praised the 71-year-old music icon's charitable efforts.
ET also has new details from inside the newlyweds' regal receptions.
A source tells ET that the prince spoke lovingly of his new bride at a reception that included a performance of 'Tiny Dancer' and three other songs by Sir Elton John.
