(CNN) - Maybe Hillary Clinton will take Katy Perry up on her offer.
The pop superstar says she'll write Clinton's theme song if the former secretary of state does decide to run for president again.
"I told hillaryclinton that I would write her a "theme" song if she needs it," the singer best known for "I Kissed a Girl" and "Firework" said Friday on Instagram, a day after she met Clinton at a book signing for Clinton's new memoir "Hard Choices."
Clinton's response indicates she may already have a Perry song in mind.
"@katyperry Well that’s not a Hard Choice. You already did! Keep letting us hear you Roar," Clinton tweeted Sunday, referring to the singer's 2013 hit "Roar."
The lyrics in the song tell the story of a woman who used to "bite my tongue and hold my breath, scared to rock the boat."
But after being "past the breaking point," she "got up. Already brushing off the dust You hear my voice, you hear that sound. Like thunder gonna shake the ground. You held me down, but I got up. Get ready cause I've had enough.
Besides being a Clinton fan, Perry is a major supporter of President Barack Obama.