Halsey has a cameo in the 'A Star Is Born' remake.
The 23-year-old pop star says it's "humbling and "unreal" that she got to appear as herself in the forthcoming romantic drama - a take on the 1937 original technicolour film - which sees Lady Gaga and Bradley Cooper take on the leading roles of struggling musicians Jackson Maine and his lover Ally.
Telling her 9.7 million followers that she landed the part thanks to the 'Born This Way' hitmaker and the Hollywood star, Halsey tweeted: "I guess now is a good time to finally tell you guys that I have a little cameo in A Star Is Born! Thank you so so much to Gaga and Bradley for including me. It was an honor to watch both of your talent and dedication on set. an all time life highlight for me for sure. (sic)"
The 'Him & I' singer added how surreal it is that she was chosen to represent the current music scene in the movie.
Asked by a follower if she plays herself, she replied: "I play myself for a very small moment! Which is insane because it means Gaga and Bradley saw me worthy of representing a piece of the current state of music in this film forever. They could have picked any artist. It was so humbling and unreal. (sic)"
Meanwhile, Gaga, 31, recently admitted she related to the film's plot, which sees her alter ego coaxed back into the spotlight by the man she falls for.
She said recently: "It's a story about love and about what Bradley refers to as the human plight of addiction. It was a remarkable experience for me. When I started out in the music industry and decided to be a singer and go for a processional career I was 19 years and I hit the ground running. I was dragging my piano from dive bar to dive bar to get jobs so that I could sing and perform for people ... when I started out, I was not the most beautiful girl in the room. [Producers] wanted to take my songs and give it to other singers but I held on to them. They made suggestions about how I should look ... but I didn't want to be viewed like other women, be sexy like other women. I wanted to have my own vision."