Justin Bieber cried when he watched 'Amy'.

Justin Bieber on Alan Carr: Chatty Man

Justin Bieber on Alan Carr: Chatty Man

The 21-year-old star has admitted he was deeply moved by the 2015 documentary about the late singer Amy Winehouse - who passed away from alcohol poisoning in 2011 aged 27 - and ended up sobbing when he watched it on a recent plane ride.

Asked when he last cried, he said: "Probably watching the Amy Winehouse documentary on the way here (to the UK). That got me. You know the ending and that whole movie was just depressing, but man, was she talented. Her voice was incredible."

But the 'Sorry' singer previously cried on stage following a performance at the MTV VMAs in August and although some were perplexed as to why he broke down in tears, he confessed it was because he finally felt "accepted".

He explained: "It was just a lot man. It was my first time performing on TV for like three years or something and I was really nervous and just wanted it to go well. I got a standing ovation and just to be accepted by my peers felt really nice."

And although it caused him to cry, he said he just wants "to make people happy" with his new album 'Purpose'.

Speaking on 'Alan Carr: Chatty Man' - which airs tonight (06.11.15) - he said: "I was in kind of a weird place so the music I was making was kind of reflecting that and I just wanted to make music that was going to make people happy and inspire them to switch directions. On this project I worked with a lot of cool people. I worked with Skrillex, Diplo and Kanye and it just kind of shifted in this cool in a different element. I just liked the direction we were going."