Justin Bieber showed off bleached blonde hair and a heavy moustache as he arrived in London ahead of an event celebrating his new album.
The singer sported a black jumper from his clothing line Drew House and was flanked by security guards as he arrived at Tape nightclub in Mayfair.
On Tuesday evening, he will mark the upcoming release of his fifth studio album Changes with a fan event at indigo at The O2.
The sold-out event will feature acoustic song performances and a Q&A.
Bieber will share new music alongside the release of his new docu-series Seasons.
In the YouTube show, he has spoken candidly about his drug use and revealed he feared it would kill him.
The Canadian singer, 25, said at his lowest point he would wake up and immediately smoke cannabis and swallow pills.
He told how members of his security team would check his pulse throughout the night to make sure he was still breathing after he would binge on ecstasy and hallucinogenic mushrooms.
He revealed he first smoked cannabis when he was 13 and later became dependent on it.
He moved on to harder drugs as he struggled with the pressure of being one of the world’s most famous musicians and admitted to drinking the codeine cough syrup and soft drink combination known as “lean”.
Bieber said the drugs were an “escape”, adding: “I was young, like everybody in the industry and people in the world who experiment and do normal, growing-up things.
“But my experience was in front of cameras and I had a different level of exposure. I had a lot of money and a lot of things.”
He said he decided to get clean because he feared the drug use was about to kill him.
“People don’t know how serious it got,” he said. “It was legit crazy scary.
“I was waking up in the morning and the first thing I was doing is popping pills and smoking a blunt and starting my day. So it just got scary.”
Bieber infamously had several brushes with the law, including allegations of vandalism, assault and driving under the influence.
In 2014, his smiling mugshot following an arrest for drink driving in Miami, Florida, went viral.
In the documentary series, Bieber blamed his behaviour on his upbringing.
“I started valuing the wrong things in this business, because there was things dangling in front of me,” he said.
“If I get this, I’ll be happy. If I do this, I’ll be happy. These are things that I think a lot of people with secure households learn at a young age. I never had that security in a family. I never had that consistency. I never had the reliability and the accountability.”
Bieber added: “My parents never gave me those tools to be a good team player.”
The singer’s wife, model Hailey Bieber, also appears in the documentary and said she chose not to get involved in his life until he “chose to get sober”.
The couple married in 2018 and Hailey was recently photographed at the Vanity Fair Oscar party without her husband.
Changes will be released on February 14.