Actress Kalki Koechlin has been shooting for Ayan Mukerji's "Yeh Jawaani Hai Deewani" in Rajasthan's sweltering heat and says the unit is having a tough time.

"Half of the shoot is still pending. It is a very difficult to shoot because we are shooting in Rajasthan where the temperature is 44 degrees Celsius... it's really hot," said the 29-year-old.

Produced by Karan Johar, "Yeh Jawaani Hai Deewani" also stars Ranbir Kapoor and Deepika Padukone and is expected to hit theatres January next year.