Louganis, 53, married paralegal Johnny Chaillot, 52, Saturday evening at Geoffrey's in Malibu.
"It was amazing because I have so many people from all facets of my life here tonight and they are all here and celebrating it is all wonderful," Louganis told PEOPLE immediately following the sunset ceremony. "I already feel different. The ceremony was so reflective and representative of who we are."
The recent Splash coach and Chaillot began dating in 2012 after finding each other on the online dating site Match.com and became engaged almost exactly a year later on April 8.
"It has been an incredible journey," Louganis said in an interview Thursday of his relationship with Chaillot. "I feel like we've been through a lifetime in a very short time."
Kira Kelly / Courtesy of LouganisDoc.com
Following the ceremony, guests including Barbara Eden, French Stewart and Bruce Vilanch enjoyed musical entertainment from friends of the couple, including recent The Voice contestant Dominic Scott Kay. Fellow Olympians Janet Evans, Nadia Comaneci and the rest of the guests dined on a vegan baby greens salad, grilled Angus filet mignon, Chilean sea bass, and more.
The couple is also hoping to make a difference with their celebration by asking for donations to charities in lieu of a traditional wedding registry.
"We are both in our mid fifties and don't need another blender so we really wanted to give back," Chaillot said of asking their guests to donate to the Human Rights Campaign and Mending Kids International.
And even amid the hustle and bustle of the large event, the newlyweds made certain that they kept in mind what was most important during the ceremony – each other.
"Wednesday night I talked to Greg and I said, 'When you look at me on Saturday I want you to know this is what I think about' and he told me what he is going to be thinking when he looks at me," Chaillot said. "So it is our little secret moment – our time."
Viridiana Lieberman / Courtesy of LouganisDoc.com