Duff McKagan made a sick teenager feel like a rock star by performing with him in Seattle, Washington this week.

Simone Capelli, 13, who suffers from brittle bone disease, was flown out to the city from his native Italy by the Make-A-Wish Foundation to stage a gig at the city's Hard Rock Cafe with the former Guns N' Roses star.

The youngster arrived in a limousine and walked a red carpet before playing guitar with the rocker on stage.

McKagan tells NWCN.com, "Simone is just a cool kid. He is cooler than most. It's not about me or any grown-ups."

essie Elenbaas, of Make-A-Wish, adds, "(It) is about making him feel like a rock star... He is very fragile right now, but his prognosis is good. He is getting better. I hope this night helps cushion what he's been going through."