According to the latest sources, Tamanna has been replaced by Karthika (daughter of former actress Radha) in Simbu starring new film Ko. Directed by K V Anand, the film making more news now.  The latest buzz is that Radha"s daughter Karthika has entered in the crew and replaced Tamanna. But the reason is unknown.

Karthika was first introduced in the Telugu film Josh opposite Nagarjuna"s son Naga Chaitanya.  But her fortunes did not rise and all her hopes now would be on Ko. But now Radha and her daughter Karthika are very much pleased with the developments in their effort to get a right chance in Kollywood.