Danny Masterson, Erika Christensen and Beck
Actors Danny Masterson, left, and Erika Christensen and musician Beck attend the Church of Scientology Celebrity Centre's 36th anniversary gala in Los Angeles on Aug. 6, 2005.
Actress Sofia Milos poses at the Church of Scientology Celebrity Centre 37th Anniversary Gala on Aug. 5, 2006, in Hollywood, California.
"King of Queens" actress Leah Remini was a highly visible member of the Church of Scientology before publicly departing in the summer of 2013.
John Travolta, Kelly Preston and Jenna Elfman
John Travolta and wife Kelly Preston, with Jenna Elfman, left, attend an exhibition of the works of L. Ron Hubbard at the 31st Anniversary Scientology Celebrity Centre Gala in Hollywood, Calif., on Aug. 5, 2000.
Actress Catherine Bell poses backstage during "Christmas Stories XIV," a collection of skits and music to benefit the Hollywood Police Activities League, at the Church of Scientology Celebrity Centre International in Los Angeles on Dec. 2, 2006.
Jason Lee performs as a cat during "Christmas Stories XIV," a collection of skits and music to benefit the Hollywood Police Activities League, at the Church of Scientology Celebrity Centre in Los Angeles on Dec. 2, 2006.
Singer Taylor Dayne performs during the 38th Anniversary Gala held at the Church of Scientology Celebrity Centre International in Los Angeles on Aug. 4, 2007.
Jenna Elfman and Nancy Schaeffer
Jenna Elfman, left, an avowed Scientologist, with Georgia State Sen. Nancy Schaeffer at the opening of the Church of Scientology's Citizens Commission on Human Rights museum in Los Angeles, on Dec. 17, 2005.
Kirstie Alley and her children Lillie and True backstage at the Church of Scientology Celebrity Centre International in Los Angeles, on Dec. 2, 2006.
Actress Priscilla Presley performs as a mannequin at the Church of Scientology's 11th annual Christmas Stories Fundraiser to benefit the Hollywood Police Activities League's annual Christmas party for underprivileged children, as well as their year-round inner city youth programs at the Church of Scientology Celebrity Centre, on Dec. 6, 2003, in Los Angeles.
Actor Tom Cruise speaks during the official opening of a new Scientology church in central Madrid, on Sept. 18, 2004.
In a 2013 interview with ABC's "Popcorn" host Peter Travers, "Mad Men" actress Elisabeth Moss expressed why she follows Scientology: "...there is so much focus on the, I guess, empowerment and, sort of, respecting yourself, and yourself as an individual."
Lifelong Scientologist and "Parenthood" actress Erika Christensen tells co-star Joy Brant on his web series in 2013: "[People assume] we're some kind of closed group and we're just the Hollywood religion ... and we worship rabbits. I don't actually know how many people think that." She also mentions the religion is a "huge part" of her life.