The midtempo pop song — Perry's next single — features several key phrases that speak to her relationship with Brand and the apparent emotional ups and downs she suffered along the way.
The track features the lyrics: "Days like this I want to drive away/ Pack bags and watch your shadow fade/ You chewed me up and spit me out like I was poison in your mouth/ You took my life, you drank me down/ But that was then and this is now."
Perry's message in the song is one of empowerment and moving on, with lyrics like: "This is the part of me that you're never gonna ever take away from me," "You're not going to break my soul" and "Look at me, I'm a sparkling firework, a dancing flame/ You'll never put me out again, I'm glowing."
She briefly touches on the ever-present public attention she receives, wanting to throw away her phone and trying to discover who her real friends are.
Katy's most intense lyrics accuse a former lover of deception and a lost innocence, the most obvious Russell reference being a statement about her wedding band: "You can keep the diamond ring, it don't mean nothing anyway/ In fact, you can keep everything — except for me."
This isn't the first time Perry has taken to songwriting to express her feelings over a public breakup. Teenage Dream track Circle the Drain reportedly documents her rocky relationship with Gym Class Heroes frontman Travie McCoy.