Elizabeth Taylor has previewed the documentary about Michael Jackson's last days, This Is It, and was already Tweeting her rave reviews Tuesday. "I was honored with the great privilege of seeing This Is It last week," she wrote. "I was sworn to secrecy, but now I can let you know about it. It is the single most brilliant piece of filmmaking I have ever seen. It cements forever Michael's genius in every aspect of creativity. To say the man is a genius is an understatement… I wept from pure joy at his God given gift." (Photo: WENN)