The music video for Katy Perry's "Part of Me" depicts her reaction to discovering her boyfriend's infidelity. It begins with Katy looking emotional while holding a locket with their picture. She storms into his workplace and sees him cheating. This prompts Katy to cut her hair short and join the army, representing her transformation into a stronger, more independent woman. Through contrasts in costumes, camera angles, and flashbacks, the video uses Katy's journey as a metaphor for moving on from heartbreak and traditional gender roles to empowerment.