When asked whether she thinks "R... Rajkumar" will be a birthday present to her dad, she said: "Of course, I think. But if there are four films in a year, one or the other comes near somebody's birthday."
"But I definitely hope, wish and pray that I give him a good and big 'dhamakedaar' gift in the form of 'R... Rajkumar'," she added.
Directed by Prabhudheva, "R... Rajkumar" features Shahid Kapoor in the title role and Sonakshi will be seen as his love interest in the movie.
It will come out on Dec 6, while Sinha's birthday is on Dec 9.