"Alvin and the Chipmunks" has become the surprise hit of 2007, having already crossed the $200 million box office mark. It is also the most successful family film of last year and is already the highest-grossing talking animal/live-action cartoon adaptation ever.

Now, producer Janice Karman has revealed to MTV News that talks of a sequel have already started, with the new film possibly focusing on the Chipettes. "There has been a lot of talk about it," said Karman. "A lot of people have been asking about the little girls."

For those unfamiliar with the characters, the Chipettes are a group of female chipmunks named Brittany, Jeanette and Eleanor, who were first introduced to audiences in the early 80s. All were voices by Karman.