Sunanda, who was upset over an alleged extra-marital affair between her minister husband Shashi Tharoor and a Pakistani journalist, was found dead in a five-star hotel room.
"Shocked to hear news about Sunanda. Condolences to Shri. Shashi Tharoor & family of Sunanda Pushkar," singer Asha Bhonsle tweeted.
Condoling the tragic passing of the entrepreneur, actress Shabana Azmi said, "Deeply saddened by Sunanda's tragic passing away. She was warm, lively and very affectionate. Heartfelt condolences to the family."
Actress Sridevi grieved Sunanda's death and remembered her as an affectionate and vibrant personality.
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"Shocked to hear about Sunanda Pushkar... Seems like yesterday she was with us at all Kolkata Knight Riders matches in Kolkata. Cheering and cheerful," said actress-entrepreneur Juhi Chawla.
Filmmaker Kunal Kohli said, "It's disturbing what social media can lead through....We have to see what is going on in our society and where social media is taking us to."
Actor-producer Anupam Kher said he is stunned to know about Sunanda Pushkar's sudden death.
"She was bright, forthright, loving & full of life. Really sad and tragic. Sunanda Pushkar lived life on her terms. She was larger than life. Had a great sense of humour. Shocking. Feel bad for her family and her son," Kher said.
Author Shobhaa De, "I refuse to call her Sunanda Tharoor. Free at last! God bless her free spirited , beautiful soul.