Bachchan, 73, was named best actor for his role in Shoojit Sircar's 'Piku' at the 63rd National Film Awards announced in the capital yesterday.

"To them that congratulate me for the National Award - most grateful... thank you is never enough expression," Bachchan wrote on Twitter.

He previously won the honour for 'Agneepath', 'Black' and 'Paa'.

Bachchan celebrated the win with wife Jaya Bachchan and the crew members of an advertisement he was shooting with the latter.

Bachchan also congratulated other winners including Gujarat, which was named the most film friendly state at the National Film Awards for its effort to ease shooting films.

The actor is currently the brand ambassador of Gujarat Tourism.

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