Vivek joined 12 contestants Tuesday night, said a source.
The other celebrity inmates in the "Bigg Boss" house include VJ Andy, Gauhar Khan, Kushal Tandon, Apoorva Agnihotri and his wife Shilpa Agnihotri, Tanishaa Mukherjee, Armaan Kohli, Asif Azim, Sangram Singh, Elli Avaram, Kamya Punjabi and Pratyusha Banerjee.
They have already spent a month in the "Bigg Boss" house.
The show airs on Colors.