Answer
Harry Connick Jr.'s best-selling album in the United States was "Only You", which was released in 1990 and sold over 8 million copies. The album also reached number one on the Billboard 200 chart. Connick Jr.'s other best-selling albums include "When My Heart Finds Christmas" (2003), which sold over 6 million copies, and "Tribute to Nat King Cole" (2008), which sold over 4 million copies.