Bollywood superstar Shah Rukh Khan has formally accepted West Bengal Chief Minister Mamata Banerjee's proposal to become the state's brand ambassador.

This was disclosed by Banerjee at the state secretariat Writers' Buildings Monday.

Sources said Shah Rukh's acceptance came in the form of a letter to the chief minister.

Banerjee had put the request to the movie icon during a tete-a-tete after the inauguration of the 17th Kolkata film Festival last November.

Shah Rukh had then verbally agreed to the chief minister's appeal.