Jamie-Lynn DeScalia (search) is stepping out from behind her role as brainy mob boss daughter Meadow Soprano to play infamous Hollywood madam Heidi Fleiss (search).

DeScalia, who was recently married and changed her last name from Sigler, filmed the new USA movie, "Call Me: The Rise and Fall of Heidi Fleiss," last December just as she was finishing up the most recent season of "The Sopranos." (search

The two productions crossed over for one day, said the film's executive producer, Stanley M. Brooks.

"They were so excited for her [at the "Sopranos"] that their production manager and our production manager were able to work it all out," he said.

The film, which debuts on cable's USA Network on March 29, was filmed in Calgary and Los Angeles.

Brooks said the movie is not a biography of Fleiss, but focuses on the relationship between Fleiss, her boyfriend and her mentor - the other L.A. "manager," Madame Alexa.

To write the script, Brooks and his team, "used every available public source there was - and believe me, everybody talked," he said. He also tracked down some of Fleiss' former employees and some of her former clients.

"I was able to get the writer in touch with a couple of 'Heidi girls' and a couple of 'Heidi clients,' who all stayed very anonymous, even on the phone," he said. "And I was able to get the director [Charles McDougall] in touch with someone who had been a client of Madame Alexa and Heidi."

Fleiss had nothing to do with the project and has not contacted Brooks about it, he said. Fleiss was arrested in June 1993 at age 27, accused of running a high-priced call girl service catering to L.A.'s rich and famous.

The case broke open a scandal that encompassed sex, violence, power and celebrities. She was rumored to keep a "black book" containing the names of top film execs and movie stars and their sexual preferences. The existence of the book sent a wave of quiet panic through Hollywood, but the book never surfaced.

Her most high-profile client identified in court proceedings was actor Charlie Sheen (search), who testified to paying Fleiss $50,000 for escorts who charged up to $2,500 a night.

Other names like Jack Nicholson, Billy Idol (search) and Mick Jagger were connected by published reports.