Stepping out for a stellar performance, Rihanna took the stage at Rai Studios in Milan, Italy on Tuesday night (November 9). The "S&M" singer was on-hand for an appearance on the Italian "X-Factor" as she belted out her hit song "The Only Girl [In the World]" for a packed audience. The Italian stop comes as Rihanna gears up for the release of her new album, which hits store shelves next…