From the May 17, 2001, issue of Smartertimes.com, a daily critique of the New York Times that was published between 2000 and 2002:
Sin of Omission: A flattering profile in the House and Home section of today's New York Times describes Harding and Mary Lawrence and a house they owned in the South of France. Given that the article goes on at such length and makes reference to "the Lawrences' spirit, a combination of American energy and European refinement," you would think the Times might have found room to mention the fact that Mr. and Mrs. Lawrence have formally renounced their American citizenship.
Lo and behold, 11 years later, the Times has gone back and done another flattering article on Mary Wells Lawrence, and, yet again, it leaves the citizenship issue untouched. This time around, the paper says she "divides her time between New York and a yacht she keeps in the Mediterranean," but it again doesn't mention what it reported back in 1995 (but not in 2001), which is that she had given up her American citizenship.
The topic is in the news these days because of Facebook co-founder Eduardo Saverin.