They captured the "I dos" of Tom Cruise and Katie Holmes, Millie Bobby Brown and Jake Bongiovi and Brad Pitt and Jennifer Aniston. Now, the photographers pull back the curtain for Yahoo, revealing what really happens at these private - and lavish - events. (Photo illustration: Yahoo News; photos: Robert Evans/Handout via WireImage via Getty Images, Millie Bobby Brown/Instagram, Sylvain Gaboury/FilmMagic via Getty Images)They're among Hollywood's most trusted secret-keepers. They're in the room when the gown goes on and the bride is handed the bouquet.