Zareen is said to have been switching between power yoga, cardio bootcamp and weight training to get into shape.
Last seen in "Housefull 2", she will now soon be seen in director Remo D'Souza's next project, starring Rajeev Khandelwal.
In Pictures: Sex scandals involving Indian politicians
Photos: Sports stars who shocked the world with their retirement
Photos: Abhishek Bachchan and Farah Khan at Boman Irani's birthday bash
Spotted: Shah Rukh Khan at Morani's bungalow in Mumbai
Spotted: Sonam Kapoor and sister Rhea at Mumbai airport