Robbie Williams has been seen walking around The Streets of Los Angeles in a gorilla costume.
The Angels star sported the outfit with a large pair of black sunglasses, which has led to speculation about the singer's state of mind.
He purchased the outfit for $60 from a Hollywood fancy dress store before heading out onto the streets reportedly the first time he has ventured out of his mansion for three months.
Speaking to the Daily Star, Robbie's friend Tara Palmer-Tomkinson said: "Of course I'm worried for Robbie.
"He's a genius and when you're that smart and have been in the public eye for so long, you want to escape."
The former Take That star recently claimed he saw a UFO flying over a Californian hotel he was staying in.
According to the Sun, it was his obsession with aliens that led to the singer's split from his girlfriend Ayda Field.