But when it came to dressing her 14 (!!) bridesmaids, the star couldn't pick just one designer. Each of her 'maids -- including sister Ashlee and BFF CaCee Cobb -- wore different gowns from fashion powerhouses like Marchesa, Jason Wu, Temperley, Carmen Marc Valvo and Carolina Herrera.
In a People.com video of the bridesmaid dress fitting, Simpson explains what was going through her head when styling her 14 "best friends on the planet."
“I didn’t really have a theme per se, but I did know that I wanted it to look ethereal and for everyone to feel the best they ever felt," she said. "A little bit angelic, but of course with rhinestones on top."
Watch the video above to see some of the behind-the-scenes footage.