Versatile actress Sai Pallavi has joined the cast for the upcoming Siva Karthikeyan and Rajkumar Periasamy film, which is produced by Kamal Haasan Actress Sai Pallavi is known for her boundless talent and gentle nature in the industry. She has a knack for choosing interesting scripts and meaty roles, and undoubtedly justified each one of them. As the actress celebrated her birthday on Monday, the makers of her upcoming films had wished her with announcements. The actress' first multilingual female-centric film, titled 'Gargi' was announced, and the tune "Soul of Vennela" was released from her upcoming film Virata Parvam. Apart from all of these birthday surprises, there was another announcement of Sai Pallavi as the lead actress for the upcoming Siva Karthikeyan and Rajkumar Periasamy film. It was earlier announced that the Tamil star Siva Karthikeyan and the 'Rangoon' director Rajkumar Periasamy are set to collaborate for an entertainer under the production of 'Ulaganayagan' Kamal Haasan. While there is an array of talent set for the film in the form of the actor, director and producer, Sai Pallavi joining the cast is like a cherry on the cake. With such talented people coming together for a film, makes the film already an exciting news, and would surely be an entertainer. The film is currently under the working title of #SK21, and is said to be a big budgeted pan-Indian film high on patriotism.