Today is the eighth anniversary of Princess Diana's death. She would have celebrated her 44th birthday last month.
This photograph of Diana dancing with John Travolta was taken at the White House on November 9, 1985. I originally found it on the U.S. National Archives and Records Administration website. (The image above is from Wikimedia Commons.)
Most NARA photos are in the public domain, and according to the site, use of this photo is unrestricted.