Beyonce had no idea her pal Oprah Winfrey would be joining her on the red carpet for the New York premiere of her upcoming Tv documentary Life Is But A Dream on Tuesday (13Feb13) - the talk show titan showed up unannounced to toast the R&B superstar's success. Oprah, who recently interviewed Beyonce for her show Oprah's Next Chapter, flew to New York for the screening of the film, which will debut in America on Saturday (16Feb13).