Ruth Bader Ginsberg is the toast of Hollywood as a new documentary about the 85-year-old U.S. Supreme Court justice debuted over the weekend to rave reviews.

"RGB," released by billionaire Mark Cuban's Magnolia Pictures, scored a 93 rating on the influential movie-review aggregation website Rotten Tomatoes.

"'RGB' might be preaching to the choir of viewers who admire Supreme Court Justice Ruth Bader Ginsberg, but it does so effectively," Rotten Tomatoes said.

Dozens of positive reviews helped the movie, which is in limited release, earn $560,000 and made it the fourth most popular movie to open over the weekend, debuting at No. 15.

Beating it were three new releases including the horror flick "Bad Samaritan," and the comedies "Tully" and "Overboard."

Among the critics lauding "RBG" were: A.O. Scott of The New York Times, who wrote its "touch is light and its spirit buoyant, but there is no mistaking its seriousness or its passion"; and Kenneth Turan of The Los Angeles Times, who called the film a "clear-eyed and admiring documentary."

The liberal icon, appointed by President Bill Clinton in 1993, is the second female justice after Sandra Day O'Connor) to be confirmed to the court, and one of four female justices to be confirmed, with Sonia Sotomayor and Elena Kagan still serving.

She has been fondly dubbed "The Notorious R.B.G." after the late rapper Biggie Smalls, who was known as "The Notorious B.I.G."

The documentary includes footage of Ginsburg's grueling, twice-weekly workout in the gym in which she sports a navy blue sweatshirt reading "Super Diva!" Directed by Betsy West and Julie Cohen, it is rated PG for some thematic elements and language.