AceShowbiz - A day after endorsing Kamala Harris, Billie Eilish has allowed her song "When the Party's Over" to be used in a campaign ad focusing on reproductive freedom. The ad, titled "Monster," features Hadley Duvall, a Kentucky woman who shares her harrowing story of becoming pregnant at age 12 after being raped by her stepfather.

Duvall explains that due to the overturning of Roe v. Wade, she may not have had the same options available to her today. She accuses Donald Trump of taking away women's freedoms and right to choose.

The ad will air nationally during the WNBA playoffs, the season premiere of "Survivor," and on "Good Morning America". It will also run in battleground states on channels such as Bravo, HGTV and Investigation Discovery.

Eilish's brother, Finneas, joined her in voicing their support for Harris. They cited reproductive freedom as one of the reasons for their endorsement and urged everyone to vote like their lives depended on it.

Eilish has been vocal in her opposition to Donald Trump since she became legally eligible to vote. In 2020, she became the youngest musician to perform at the Democratic National Convention, where she spoke out against the danger she believed Trump posed to the nation.

Harris previously received permission from Beyonce Knowles to use her song "Freedom" as her unofficial campaign anthem.