"It's the best birthday gift I could have got. I am thrilled and I feel blessed," Kangana, who turned 29 on March 23, said in a statement.
She is especially excited "since Mr. Bachchan is the Best Actor with me".
Megastar Amitabh Bachchan has been named the Best Actor for his effortless portrayal of a nagging father suffering from constipation in "Piku".
Now, Kangana is "thinking about what to wear for the ceremony".
This is Kangana's third National Film Award victory. She had won the Best Supporting Actress for "Fashion", and Best Actress for "Queen".