The 'Sirens' singer, whom is currently in New York to work on her upcoming autobiographical play, took to social media site Twitter to pay tribute to the heroes of the events which unfolded 15 years ago.
She wrote, "Taking off and thinking of all the brave people of 9/11‼️ Firefighters, police, brave souls who sifted through rubble of US. Every person of 9/11 is a hero."
Shortly beforehand, the singer-actress paid tribute to the state: "Forget how amazing New York is. Lucky to have lived so much of my life here. Many of my happiest years were spent in three apartments in the Big Apple."