Tagg Romney, eldest son of Mitt and Ann Romney, tweeted this afternoon, “Happy 2 announce birth of twin boys David Mitt and William Ryder. Big thanks to our surrogate. Life is a miracle.” Ann Romney tweeted her excitement about the event shortly after the announcement: “Grandchildren 17 and 18 are here – congratulations @TRomney and Jen! We can’t wait to meet David and William.”