Julia Roberts' actress niece Emma Roberts has so impressed the producers of the new Nancy Drew mystery movie, they've already committed to a sequel, in which she'll also star.

The new family adventure film, in which Roberts will play the famous literary sleuth, won't hit cinemas until this summer, but the teenage actress is already slated for another Drew film.

And Nancy Drew director Andrew Fleming is so stunned by Roberts' acting talents he has signed her up to play an equestrian who attempts to win a rodeo competition in another film, Rodeo Girl.