The 28-year-old actress, who bagged her career's second National Award for her poignant portrayal of a young girl left at the altar by her fiance in "Queen", did not follow the usual trend of donning a traditional outfit to the ceremony.
Kangana's attire was designed by New York-based Indian designer Bibhu Mohapatra, whose collection was earlier worn by US first lady Michelle Obama at her India visit earlier this year.
"@kangana_ranaut in #Bibhu at #nationalfilmswards #delhi #bestactress...," Bibhu tweeted.
While Kangana took home the best actress National Award, South Indian star Vijay won the best actor trophy for his role in Kannada film "Nanu Avanalla Avalu".
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Other Bollywood actresses including Vidya Balan and Priyanka Chopra, who bagged the National Award for "The Dirty Picture" and "Fashion" respectively, wore a saree at the prestigious event.
Interestingly, Kangana, who won her first National Award for "Fashion" in the best supporting actress category, also went for an Indian dress, a black salwar kameez.