Ryan Gosling and Michelle Williams are easily two of the best actors working in Hollywood, so the pairing of the duo in Blue Valentine, a film more than a decade in the making and an entry at the Sundance Film Festival last January, seems at once natural and wonderful.These two exceptional performers were seemingly star-crossed to display their talents alongside each other. Gosling mesmerized me when I saw him in The Believer at the 2001 Sundance Film Festival, three years …