Naomi Watts plays a different side of the people's princess in the trailer for "Diana" -- the version that the world so rarely got a glimpse of.
The movie follows the most famous woman in the world falling in love with heart surgeon, Dr. Hasnat Kahn (Naveen Andrews) at the end of a life cut far too short.
The film, which spans the final two years of Princess Di's life, also chronicles her personal campaign against land mines.
"Diana" comes out Sep. 20.
Watch the trailer: