For the outdoor affair, Jessica, 41, dazzled in a plunging sparkling silver gown that dripped in gems and rhinestones, while Ashlee, 37, showed out in a flowing Marchesa dress that featured fringe feathers and minimal glam.
"My best friend’s wedding!" Ashlee captioned an Instagram post on Tuesday while sharing a photo from the big day. "Such a beautiful bride, and a wedding full of fancy gowns and so much love."
As for the bride, Pearson donned a white collared form-fitting dress complete with ruffled shoulders that matched those on the lower part of the gown below the waist. The ensemble included gold button accents.