'Naatu Naatu' singer Kaala Bhairava, who missed out on acknowledging Ram Charan and Jr NTR after Oscar win, apologised to the fans. "I have no doubt Tarak anna and Charan anna are the reason for the success of 'Naatu Naatu' and 'RRR'...I was ONLY talking about who all helped me get...opportunity for Academy stage performance. Nothing else," he tweeted.