"Loving the cold....shoot in beautiful Vienna! #AeDilHaiMushkil," Karan wrote on his Twitter account.
The film is directed by Karan.
Produced by Fox Star India and Dharma Productions, "Ae Dil Hai Mushkil" will feature Aishwarya Rai Bachchan, Ranbir Kapoor and Anushka Sharma in key roles.
To be shot across the globe, including locations like Delhi, New York, London and Paris, the love story dealing with relationships and heart breaks, will hit the screens on June 3, 2016.