Watch 'Judwaa 2' cast sing 'Tan Tana Tan Tan Tan Taara' at trailer launch

Varun Dhawan, Taapsee Pannu and Jacqueline Fernandez enthralled the audience by singing the song 'Tan Tana Tan Tan Tan Taara' at 'Judwaa 2' trailer launch in Mumbai. Watch their performance in this video