Slash had no idea who Robbie Williams was when he introduced himself.
The former Guns N' Roses guitarist met the British pop star - who comes from Slash's hometown of Stoke-on-Trent - in a Los Angeles hotel but only realized who he was when the 'Angels' singer got up to sing.
Slash told Q magazine: "I met him in this hotel. This guy comes up and says, 'You're Slash right?' And I was like, 'Yeah.' And he goes, 'You're from Stoke - I'm from Stoke!'"
"I'm thinking, 'Who the f**k is this guy?'"
"Later on that evening I went to jam with this covers band Camp Freddy. I got up to do 'Whole Lotta Love' and this guy got up to sing and it was Robbie Williams."
The Velvet Revolver rocker revealed the pair's friendship came to an end when Robbie checked himself into rehab to be treated for his addiction to prescription drugs earlier this year.
He added: "We started hanging after that, but then he got sober and I didn't see him for a long time."
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