Mark Zuckerberg’s longtime-girlfriend-turned-wife, 27-year-old Priscilla Chan, bought her $4,700 Claire Pettibone bridal gown off the rack for the couple’s surprise wedding this weekend. The designer, who found out about the dress while at Disneyland for her daughter’s fifth birthday, tells Buzzfeed Shift that she has no idea where Chan even made the purchase. “We’re honestly not sure. I think she may not have used her actual name,” said Pettibone. They’re still in the process of tracking down which outlet sold that exact dress, which has apparently been part of Pettibone’s line for about two years now.