Singer Katy Perry will appear at a rally in Des Moines, Iowa on Oct. 24 to rally supporters of Hillary Clinton, the campaign said on Saturday.

The event will be in advance of the Jefferson-Jackson Dinner, an essential stop for Democratic candidates seeking to win the Iowa caucuses.

Last year, when Clinton was on her book tour for “Hard Choices,” Perry attended an event with the former Secretary of State at CAA and told her that she would write a theme song for her “if she needs it.”