Article continues below advertisementThe Church of Scientology recently scored its biggest stars' attendance at the controversial religion's annual L. Ron Hubbard Birthday Event.Tom Cruise, John Travolta and Elisabeth Moss subtly showed face at a celebration for Scientology's holiest day, its founder, L. Ron Hubbard's birthday.Hubbard was born on March 13, 1911. In honor of his 115th birthday, Scientology's current leader, David Miscavige, hosted a commemorative gathering at Eckerd Hall in Clearwater, Florida on Saturday, March 14, according to The Underground Bunker's Tony Ortega.