Mumbai: Actress Vidya Balan, who is gearing up for the release of her upcoming film "Kahaani 2", says she likes her co-actor Arjun Rampal's infectious smile. "I like his (Arjun's) smile. Whenever he smiles I also burst into laughter... Every time he starts giggling, the entire set starts laughing. He has such an infectious smile," Vidya said. The "Rock On 2" actor is playing a police officer in the second instalment of filmmaker Sujoy Ghosh's movie "Kahaani". Vidya, who will essay the role of Durga Rani Singh in the film, says she found it an amazing experience to work with Arjun. "He is a great actor and nowadays he is doing quite unusual and different kinds of roles," she said. The 38-year-old actress says in the film, which is slated to release in December 2, Arjun "has played a character, which he had never done before".