All three of them are likely to stay inside the house for two weeks. In fact, there is a possibility that they will 'make rules' as they have claimed in the promos. 

Notably, Siddharth Shukla won the 'Bigg Boss 13' previous year and became the most popular contestants in the history of the show, according to Ormax media. He was also the most tweeted contestant of Bigg Boss 13. He was voted the most favourite contestant of Bigg Boss 13 in polls conducted by many news channels. 

'Ye Rishta Kya Kehlata Hai' fame Hina Khan took part in Bigg Boss season 11 and emerged as the first runner up. She became quite popular for her fashion sense during that season. She was also the most loved contestant on Bigg Boss 11 according to Ormax media. 

Gauhar Khan entered the Bigg Boss house in 2013 and emerged as the winner of the show. Khan became popular for her love affair with co-contestant and actor Kushal Tondon on the show. However, Tondon was asked to leave the Bigg Boss house as he hit VJ Andy on the national television. Khan dramatically took an exit from the house as well but returned a day later.