He is rumored to be dating Taylor Swift, and was spotted with the singer June 3 in Nashville.
"This isn't a new couple alert or a secret relationship," a source told E! News this month.
"The only people this has been a secret to is the media because all of us -- Taylor and Joe's closest friends and their families -- were aware they have been together for several months and have known each other a long time," the insider added.
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