What Billie Eilish Says Miley Cyrus Told Her Between GRAMMY Wins (Exclusive)

Billie Eilish and Finneas chat with ET’s Kevin Frazier backstage at the 66th Annual GRAMMY Awards, which aired Sunday on CBS and Paramount+. Billie reacts to winning Song Of The Year for 'What Was I Made For?' and explains why she thanked Greta Gerwig in her acceptance speech. Plus, she reveals what Miley Cyrus said to her after winning Record of the Year for 'Flowers.'