John Travolta became a Scientologist in 1975 and has been one of the faith's strongest supporters. Click through the gallery for a look at other celebrities who identify as Scientologists.
News of Tom Cruise's split with Katie Holmes and questions about any role that Cruise's status as a Scientologist played in the divorce had a lot of people talking about Scientology. The church issued a statement about the issue.
In 2010, actress Kirstie Alley told CNN's Larry King that Scientology, her faith for three decades, has helped her lose weight.
Fox News journalist Greta Van Susteren rehearses for the "Kaleidoscope" Thanksgiving Day special in 2009.
A high-profile member of the Church of Scientology, Nancy Cartwright is also the voice of Bart Simpson on the animated series.
Scientologist Jenna Elfman is best known for her starring role in the TV sitcom "Dharma and Greg."
Actress Juliette Lewis defended Scientology and fellow proponent Tom Cruise in a recent interview.
Beck came into the spotlight in the '90s with his breakthrough single, "Loser."
Actress Anne Archer was nominated for an Academy Award for her role in the 1987 movie "Fatal Attraction."
Catherine Bell starred in the TV series "JAG" and "Army Wives."
Actor Danny Masterson is known for his role in "That '70s Show."
Actress and model Bijou Phillips wed Masterson in 2011.
Actress Jennifer Aspen is best known for her work on "Party of Five."
Actor Jason Lee starred in the television series "My Name is Earl."
Actress Lynsey Bartilson co-starred in the sitcom "Grounded for Life."
Actress Erika Christensen co-stars in the television series "Parenthood."
Veteran rapper Doug E. Fresh has performed at the Church of Scientology events.
- HBO is producing a film based on "Going Clear," a book about Scientology
- The network, preparing for legal battle, has hired 160 lawyers, according to exec
- Documentary will be directed by Alex Gibney of "Taxi to the Dark Side" fame
(CNN) -- HBO is backing a documentary based on "Going Clear," a book about Scientology and Hollywood -- and isn't taking any chances with the legal side of things.
"We have probably 160 lawyers" looking at the film, HBO Documentary Films President Sheila Nevins told The Hollywood Reporter. (HBO, like CNN, is a unit of Time Warner.)
"Going Clear," by Pulitzer Prize-winning writer Lawrence Wright ("The Looming Tower"), digs into the life of Scientology founder L. Ron Hubbard and the influence his church has had on its believers, many of whom have close ties to Hollywood.
Among Tinseltown's famous Scientologists are John Travolta and Tom Cruise.
Investigating the Church of Scientology
Some of Wright's findings, including claims of abuse, didn't go over well with the church.
"The stories of alleged physical abuse are lies concocted by a small group of self-corroborating confessed liars. The hard evidence clearly shows that no such conduct ever occurred and that in fact there is evidence that shows it did NOT occur," the group's spokeswoman, Karin Pouw, told CNN's Miguel Marquez in 2013.
Author of Scientology book: 'There have been a lot of tears in this story'
The documentary is being directed by Alex Gibney, who won an Oscar for 2007's "Taxi to the Dark Side."
HBO expects to air the documentary in 2015.
