PRNewswire -- MGM MIRAGE (NYSE: MGM) announced today that it has commenced an underwritten public offering of 81.0 million shares of its common stock. It is expected that the offering will have gross proceeds of approximately $1 billion. Merrill Lynch & Co., Deutsche Bank Securities, J.P. Morgan, Morgan Stanley and UBS Investment Bank are acting as joint book-running managers for the offering. The underwriters for the offering will have a 30-day option to purchase up to an additional 12.15 million shares of common stock from the Company to cover over-allotments, if any.