Jennifer Hudson's Oscar-winning Dreamgirls performance has led to her landing a role in a potential box-office blockbuster.

The American Idol 3 seventh-place finisher has joined the cast of New Line Cinema's Sex and the City: The Movie, The Hollywood Reporter reported Tuesday.  Hudson will play Louise, the assistant of Sarah Jessica Parker's Carrie Bradshaw character.  Former Sex and the City stars Kim Cattrall, Kristen Davis, Cynthia Davis and Chris North will all also be part of the film's cast.

Hudson portrayed powerhouse singer Effie White in director Bill Condon's critically-acclaimed 2006 film adaptation of Broadway's Dreamgirls musical. The performance has been a best supporting actress goldmine for the 25-year-old, as she has claimed numerous awards -- from the Golden Globe and Oscar to the Screen Actors Guild and British Academy of Film and Television Arts -- for her portrayal of White.

She recently completed production on Roman Woods' ensemble drama Winged Creatures, according to The Reporter, which also stars Kate Beckinsale, Forrest Whitaker, Jackie Earle Haley and Dakota Fanning.  In addition, Hudson is currently in the studio working on her debut album, which Arista Records is expected to release early next year.

Sex and the City: The Movie, which is based on the Emmy Award-winning HBO comedy series that aired from 1998 to 2004, is set four years after the show ended.  Filming begins next week in New York, according to The Reporter.