Billie Eilish dropped behind-the-scenes footage from her special concert, "Happier than Ever: A Love Letter to Los Angeles," detailing how she made an animated segment for the event. The concert premiered on Disney Plus on Sept. 3.

The 19-year-old singer took to Instagram Story on Sunday to share an impressive video that she recorded on June 25. During the special concert, there were animated sequences shown for a brief period to convey images like bleeding and driving a car.

In the video, the singer could be seen wearing a black and red motion capture suit and taking a selfie video to flaunt the entire setup. She painted dots and lines on her face for the motion camera to capture her expressions while white balls were added to her shoes, legs and hands.

At the end of the video, she showed her middle finger to the camera. "Shooting the motion picture for the animation in 'a love letter to LA' craaaaaaazyy," she wrote on the video.

One of the fans took to Twitter on Sunday to share the same video.

The concert featured all 16 songs from her newly released album, "Happier Than Ever."

The singer performed at an empty Hollywood Bowl located in the Hollywood Hills, Los Angeles, with her brother, musician Finneas O’Connell. The show also featured special guests including Brazilian guitarist Romero Lubambo and Gustavo Dudamel.

Over the weekend, the singer shared a glimpse of her animated version and performance on Instagram.

"It was such an honor to work with so many amazing and talented people on this and celebrate this city that I love so much," she wrote in the caption. "It was such a full-circle moment _ and so cool getting to perform my entire album front to back for you at the one and only @hollywoodbowl," the singer added.

"I cannot wait to be with you again SO SO SOOOOON. love you all so so much and hope you enjoy _ " she concluded.

On the work front, the singer is currently filming a documentary, "What Do You Want From Me?" which is slated to release next year. It will also feature Antwan Eilish and O'Connell.

US singer/songwriter Billie Eilish, one of the young chairs of the 2021 Met Gala, arrives at the Metropolitan Museum of Art on September 13, 2021 in New York US singer/songwriter Billie Eilish, one of the young chairs of the 2021 Met Gala, arrives at the Metropolitan Museum of Art on September 13, 2021 in New York Photo: AFP / ANGELA WEISS