Megastar Amitabh Bachchan will be seen shaking a leg in his signature style in the forthcoming film "Department" and actress Anjana says she was stunned to see Big B's amazing energy level.

"There is a situational song where Mr. Bachchan is dancing for me and Rana's (Rana Daggubati) wedding. The wedding dance song is called 'Kammo' and is sung by Mika," Anjana, who was earlier seen with the megastar in a Dairy Milk chocolate ad, told IANS.

"The song was picturised before Mr. Bachchan's surgery (in February). It's a fun song choreographed by Shabina Khan. The amount of energy that Amitabh Bachchan and Sanjay Dutt carry with them is commendable. It is so encouraging," she added.

Composed by Bappa Lahiri, the song is sung by Mika and Sudesh Bhosle. Directed by Ram Gopal Verma, "Department" is scheduled for a May 18 release.