MUMBAI: Actor Amitabh Bachchan has begun rehearsing for Kaun Banega Crorepati 4, which will go on air on Sony TV later this year.

Bachchan will be dubbing today for the promo of the show, he wrote on his Twitter page. "Finished gym now at dub for promo for KBC. They should be out soon…," he said.

Prior to beginning the rehearsals for the show, he wrote on his blog, "Tomorrow (Friday) I start rehearsals for KBC… just getting the hang of things to come, the innovations and the formats. There is still time for its inception, but better to do it now and get acclimatized, than make mistakes later on."

On his Twitter page, the actor added, "Rehearsals for KBC up and about! What nostalgia! Great to be back with familiar faces of crew. Was almost as though I had not left."

KBC was first launched in India in 2000 on Star Plus with Bachchan as the host. While the second season was also hosted by the actor, the third season saw Shah Rukh Khan take the host’s seat.