The fitness diva of Bollywood Sushmita Sen has been celebrating her birthday today i.e on November 19. The senior actress is quite aware of her fitness. She is nowhere near slowing down and is defying age. At the age of 44 years also, she is doing amazing workouts, which are truly inspirational. Her fitness is undoubtedly a big challenge for all. She has always been fit and now is taking it a notch higher by working out harder. The Miss Universe 1994 is a proud, single mother of two, not caring about what society has to say.