The Sucker hitmaker tied the knot with the Game of Thrones actress in a surprise ceremony on 1 May 2019, shortly after attending the Billboard Music Awards in Sin City.
Joe was joined by his brothers and bandmates Kevin and Nick, as well as celebrity guests like superstar DJ Diplo, who decided to livestream the impromptu nuptials, which were officiated by an Elvis Presley impersonator, on Instagram.
Two people noticeably absent from the wedding party were the groom's parents, Kevin Sr. and Denise, who were less than pleased when they read all about the ceremony on the Internet.
"They did find out online," Joe confessed on SiriusXM's Hits1.
"Well, in my mind, that was the legal portion of the marriage," he explained. "So I was thinking, like, 'look, this is not the most important day.' There's an important day, I mean, I'll keep [the details] private, but [it's] ahead of us. So we were like, this is just whoever's in town."
Joe and Sophie had already been planning to become husband and wife in a formal ceremony in France this summer. The singer recently insisted the Vegas nuptials were simply to legalise the union in the U.S.
The matter was made all the more awkward for Joe's mum and dad as they initially heard the news from staff members at their North Carolina restaurant. "I think a couple of their staff walked up and were, like, 'Congratulations! I saw [the news].' And then they had to find out," Joe said.
The 29-year-old has been trying to make it up to his parents ever since: "So I was doing a lot of apologising and 'Hey, you guys want to come out to L.A.? I got you four spas [treatments] at the Four Seasons,'" he shared.