Day-Lewis has gone at great length to transform himself to portray the 16th president of America. Like always, the actor remained in character, even when the cameras were not rolling, E! Online reported.
"Obviously, we when cast Daniel we knew that in many respects, physically, he would look very much like Lincoln.
"But it was a combination of the work that was being done in the makeup and hair trailer and also what Daniel himself took on for the physical appearance. He got quite thin and gaunt. It was quite extraordinary to see him for the first time," film's producer Kathleen Kennedy said.
The film recounts how Lincoln steered the country during the civil war and Kennedy says the film is not a biopic.
"It's really the last three or four months of his life and all the things that were really culminating at that point historically.
"What's really interesting about it is you get a sense of just what an incredible leader Lincoln was. In some ways, like today, the country was very divided and he had to walk this bipartisan path to get so much done in a relatively short amount of time."