Former Guns N' Roses bassist Duff McKagan is a fan of Justin Bieber

The rocker is impressed by the 'Baby' singer's musicianship and thinks he puts on a great live show.He said: "Do you know what? Justin's a rocker. Man, he actually sings at his gigs, and the band's a real band, and he plays drums and he's f***ing great. Justin Bieber is a rocker for sure."The Velvet Revolver star discovered Justin's music through his two daughters, 13-year-old Grace and 10-