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Carrie UnderwoodĀ was a surprise guest at both ofĀ Guns Nā Roses' weekend shows inĀ the UK. She sang two songs during their July 1st and 2nd shows -- "Paradise City" and "Sweet Child O' Mine." Carrie was in London last week to promo her new album,Ā Denim & Rhinestones..Ā Ā