Superstar BARBRA STREISAND is set to come out of retirement to perform at the grand opening of the Planet Hollywood Resort + Casino in Las Vegas. The award-winning singer will headline the entertainment line-up at the gala next month (Nov07), reports the New York Post's Page Six. The 65-year-old will be joined by political satirist Jon Stewart, Bruce Willis and his band The Accelerators as well as Earth, Wind + Fire. Planet Hollywood co-chairman Robert Earl says, "We are throwing the biggest party Las Vegas has ever seen."