The dress everyone with access to a "like" button has been talking about was reportedly bought in Denver.
Chan, buying the gown under the name Pricilla Taun, gave her wedding date as May 19th and had her assistant handle everything.
The "Sky Between the Branches" gown was designed by Los Angeles-based designer Claire Pettibone who told People Magazine that she thought it was worn very gracefully.
"Her gown seems to perfectly capture her personality -- understated and elegant with a touch of sparkle. It's a perfect blend of femininity and fashion," Pettibone said.
Life and Style Magazine reports that Chan bought the dress in October 2011, and returned in April to purchase accessories.
While the guests were surprised with the wedding -- they thought they were celebrating Chan's graduation from medical school but ended up dancing the night away to Green Day and Billy Joel instead -- so was Pettibone, the dress's designer.
From Pettibone's blog:
My husband Guy is checking the day’s news on his phone while I am about to drift off…”HONEY! Mark Zuckerberg…the Facebook guy” yeah? “He got married today, and the bride…the bride…the bride…” Yeah? WHAT?!!
“She’s wearing your gown, look!”
Yes, that is Sky Between the Branches, wow... wow... OMG WOW!!! Do you think my publicist is awake? It’s Saturday night 11:30, I’m texting her! The news spread like wildfire, and since the Associated Press broke the story, and no one had the designer info, they just said the bride wore “a traditional white gown”. LOL, that’s the first time I’ve been called traditional!
Speaking of wildfire, the photo of Chan's dress and the newlyweds has already garnered over 1.2 million likes on Zuckerberg's Facebook page.
LOOK: Chan in her wedding dress with Zuckerberg on their wedding day
The Morning Email helps you start your workday with everything you need to know: breaking news, entertainment and a dash of fun. Learn more