Haasan said he was in the U.S. for his film 'Vishwaroopam 2.'
"It is 12th morning here in US. Many more happy returns of the day brother Rajini. Am here for VR2 (Vishwaroopam 2) final mix. All the best in everything you want to do. Yours Kamal," he said in a tweet.
Rajinikanth turned 67 today.