Lady Gaga

The 'Poker Face' hitmaker revealed that she was living with post-traumatic stress disorder (PTSD) in 2016 and urged people to be open about their mental health issues.

Gaga told The Mirror: "When my career took off, I don't remember anything at all. It's like I'm traumatized. I needed time to recalibrate my soul. I definitely look after my well-being...I openly admit to having battled depression and anxiety and I think a lot of people do. I think it's better when we all say: 'Cheers!' and 'fess up to it.'"