People.com has released some of their exclusive footage of Julianne & Brooks' wedding on a video. With their friends having already posted stuff on social media, it really highlights how archaic it is for a paper magazine to have a publication of 6 days after the actual wedding day.
Turns out the wedding was a full weekend, (Fri & Sat,) not just the wedding day. Their friends got to hang out the whole day before with the couple, go to the beach, go sailing, play Jenga, eat pizzas, etc., and have a very down to earth, casual, relaxed time. That theme carried out through the wedding day.
Julianne had a second, white, reception outfit to wear, (a very elegant yet playful swimsuit coverup dress) that I like much better than her wedding dress, which was by Marchesa. I'm surprised as they usually seem to be a much dressier designer that the plain one she wore.

Maybe they designed her swimsuit coverup dress too?
At about the 5:30 min mark, Julianne dances with her (& Derek's) father. Being a graceful dancer runs in the family.
Video link here:
http://people.com/pen/0000015a-5b94-d843-a37a-dfde5c800000/0000015d-3540-da4c-a77f-b7e2be820000/