Ariana Grande opened up about the Manchester Arena bombing in a letter shared in her new docu-series, Dangerous Woman Diaries.
The attack took place on Grande's tour in May 2017 when a suicide bomber detonated a homemade explosive device in the arena foyer, killing 22 people.
She described the atrocity, which left hundreds injured, as something "that seems impossible to fully recover from".
Grande, 25, was physically unharmed in the attack but suffered from post-traumatic stress disorder.