Update, 9/23: The Gigi-Joe romance just got a meet-cute back story. Apparently seven years ago, Joe first asked Gigi to hang: "We met at the Grammys when I was 13 years old," Hadid said during a Periscope Q&A. "And he asked me to a baseball game, and I said, 'No.' I was so nervous; I literally didn't even know what it meant to hang out with a boy. And also, Grammys are on a Sunday, and I didn't want to tell him that I had school the next day, so I was like, 'No, maybe next time.'"

The 19-year-old gave her his number though: "[He] wrote it on a piece of paper and gave it to my mom. And then we've been friends ever since. Except now. We're more than friends, obvs." Ah, timing really is everything!

Update, 7/22: Gigi Hadid and Joe Jonas have officially endorsed their "G.I. Joe" couple status, with Gigi proudly wearing her part of the nickname out:

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Hellin Kay

Celebrity couples these days, literally spelling it out.

Joe Jonas and Gigi Hadid are dating, and as is now just about traditional for cool, young celebrity couples, they need a cutesy nickname. Courtesy of Cara Delevingne, who just shared the above Instagram snap of them sharing a helicopter ride together, that nickname is G.I. Joe. At least unless/until you can come up with a better one?! (And no, JoGi doesn't cut it because that looks more like a chemical compound.)

Also, holy moly, Joe Jonas's white fur coat. That's a lot of look, Joe.