Sunanda, who was active in social circuits, was found dead in a New Delhi hotel room Friday night.
Here's what the celebrities posted on Twitter Saturday:
Asha Bhosle: Shocked to hear news about Sunanda. Condolences to Shri. Shashi Tharoor and family of Sunanda Pushkar.
Sridevi: Saddened by the unfortunate demise of a warm, affectionate, vibrant and good soul. RIP Sunanda Pushkar.
Shabana Azmi: Deeply saddened by Sunanda's tragic passing away. She was warm, lively and very affectionate. Heartfelt condolences to the family.
Farhan Akhtar: Sunanda Pushkar's untimely demise is tragic. RIP. Deepest condolences to Shashi Tharoor and family.
Juhi Chawla: Shocked to hear about Sunanda Pushkar. Seems like yesterday she was with us at all Kolkata Knight Riders matches in Kolkata...cheering and cheerful.
Riteish Deshmukh: Deeply saddened and shocked. RIP Sunanda Tharoor. Heartfelt condolences to the family.
Soha Ali Khan: Shocked to hear about Sunanda, she was so full of life and energy, she lit up the room. I can't believe it. My deepest condolences to her family.
Javed Akhtar: It is shocking that some one like Sunanda, full of zest for life, full of joy and happiness is no more. Deepest condolence to Shashiji.
Genelia Deshmukh: RIP Sunanda Pushkar Tharoor. Prayers and condolences to the family.
Ritesh Sidhwani: Saddened to hear about Sunanda Pushkar, may she rest in peace. My condolence to Shashi Tharoor.
Shekhar Kapur: Sunanda Tharoor what a tragedy! And so sudden. I left Delhi hotel listening to Shashi speak at 7.30 p.m., landed in Mumbai to hear of her death.
Madhur Bhandarkar: Shocked and saddened to hear about Sunanda Tharoor. She was one of the most vibrant and nicest people around. May her soul rest in eternal peace.
Anupam Kher: 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.
Sonu Sood: Shocked to hear about Sunanda Pushkar...life is so unpredictable. RIP.
Kunal Kohli: People living in public gaze have it very tough, we don't realise the pressure we cope with, till a day (when) we just can't cope, RIP Sunanda Pushkar.
Vivek Oberoi: Shocked to hear about Sunanda, such a vibrant, beautiful person, full of life and exuberance...gone too soon!
Neha Dhupia: Shocking news about Sunanda Pushkar. A person so full of life, can't believe she's gone. Heartfelt condolences to Shashi Tharoor and the family.
Kailash Kher: Shocked to hear Sunanda Pushkar's sudden tragic demise, was supposed to perform for their event in Dubai, uncertain life, RIP Sunanda...prayers.
Sophie Choudhry: Sunanda Tharoor, so full of life and love. Just not able to come to terms with this news. Wish it weren't true. RIP beautiful...love and prayers.