Justin Bieber tells fans at Stockholm show he can't sing 'Despacito' because 'I don't even know it'

Lo siento, no puede cantar.

Justin Bieber calmly explained to fans (in English) at last week's Stockholm show that he can't perform "Despacito" no matter how many times they chant for it: "I don't know it," he said repeatedly.

One of the biggest hits of the summer, "Despacito" is currently perched at No. 1 on the Billboard Hot 100 chart. The lyrics are entirely in Spanish. To be fair, it's actually not his own song -- he's featured on the Luis Fonsi & Daddy Yankee track.

The explanation didn't sit well with one fan, who in response chucked a water bottle straight at his head. "Don't throw things at me, please," he replied calmly.

Watch the strange moment in the video below: