The media firm acquiring Hello Sunshine is being run by former Walt Disney Co. executives Kevin Mayer and Tom Staggs. : Reese Witherspoon's media business, Hello Sunshine, has been sold to a media firm backed by private-equity group Blackstone Group Inc., the companies said in a joint statement to Wall Street Journal on Monday. Terms of the agreement have not been publicly disclosed, but people familiar with the matter told the Journal the deal gives Hello Sunshine a valuation of about $900 million.