New Delhi, Mar 28 (ANI): Director R.Balki, who had last worked with actor Amitabh Bachchan in ‘Shamitabh’ and ‘Paa’, is extremely happy about Big B winning the national award as a best actor in Shoojit Sircar's ‘Piku’. R.Balki was in the national capital to promote his film, ‘Ki and Ka’ starring Kareena Kapoor Khan and Arjun Kapoor. While talking about Amitabh Bachchan, R.Balki said he would love to work with the 73-year-old actor again once he comes up with some concept of his caliber.