Naomi Watts: Brunette for 'Diana'!

Naomi Watts goes brunette for her role as Princess Diana in the upcoming biopic on the life of the late royal, Diana, on Tuesday (August 14) in London, England.

The 43-year-old actress was joined on set by Lost actor Naveen Andrews, who is playing Diana‘s love Dr. Hasnat Khan.

PHOTOS: Check out the latest pics of Naomi Watts

Diana is about the life of Princess Diana as told by her lifelong bodyguard, Ken Wharfe.

35+ pictures inside of Naomi Watts and Naveen Andrews on the Diana set…