Check out this debut trailer for “Diana,” the story of the late Diana, Princess of Wales and her relationship with Dr. Hasnat Kahn, a Pakistani heart surgeon. Oscar-nominated actress Naomi Watts is stepping into Diana’s heels, while “Lost’s” Naveen Andrews is playing Kahn.

Earlier this year, Watts told ABC News that she initially didn’t want to play the part of Princess Di but that the script was too good to pass on.

“I kind of wanted to say no, but I couldn’t,” says Watts. “I just felt that she was a fascinating woman … I read all the biographies, I looked at every piece of footage [in preparation for the role].”

“Diana” will be released Sept. 20, 2013.