The 32-year-old actress revealed that she did not go back to being blonde after the film as this transformation came at a time when she was viewed just as a pop singer, reported Entertainment Weekly.
"There was a real significance to colouring my hair. As silly as it sounds, there was a real significance in the way that people saw me, but also in the way that I carried myself and that I saw myself," said "This Is Us" star.
"A Walk to Remember" is celebrating its 15th anniversary this year.