The late, great actor and model Anna Nicole Smith tragically passed away in 2007, from an accidental drug overdose, at the age of just 39. At the time of her untimely death, she left behind a baby daughter named Dannielynn Birkhead, who has grown up to be Anna Nicole Smith's twin. Dannielynn, who was born on September 7, 2006, was less than 6 months old when her mother died.