Johnny Depp has appeared on stage alongside Jeff Beck in the UK for the second night in a row, amid his ongoing US legal battle.
Concert-goers had expressed hope the actor may appear at the Royal Albert Hall in west London after performing with Beck at Sheffield City Hall on Sunday.
In Sheffield they reportedly performed their cover of the John Lennon song Isolation, which they previously released in 2020.
Depp took to the stage once more on Monday, prompting audience members to post videos of him singing on social media.
One, Angela Flannery, said: "I was pretty shocked."
Ms Flannery, 38, from Southend-on-Sea added: "(I have) always been a massive fan of his. My other half took me to this gig just to see Jeff Beck, I had no idea Johnny would be playing.
"It was brilliant, such a fantastic night in general... a special mention to the drummer girl, she was absolutely amazing (and) Johnny Depp smashed it.
"I'll die happy (that) I've been in the same room as him now."
Depp's appearance in the UK has surprised many as he awaits a verdict in his multimillion-dollar defamation lawsuit with his ex-wife Amber Heard.
The Pirates Of The Caribbean actor is suing his former partner over a 2018 article she wrote in the Washington Post, which was titled: "I spoke up against sexual violence - and faced our culture's wrath. That has to change."
The article does not mention Depp by name, yet his lawyers say it falsely implies he physically and sexually abused the actress while they were together.
On Friday both sides gave their closing statements, urging jurors to consider other victims of domestic abuse.
The jury is now deliberating on the case, which began on April 11 and involved six weeks of evidence.
