You'll always remember Frankie Jonas as the "Bonus Jonas," but he's all grown up now — and even went to prom with his girlfriend! (Yep, he has a girlfriend.) Her name is Austin, and she even shared a photo of them kissing right on the lips in the photobooth.

He posted a photo of them doing the DAB together, and wrote, "There's no one on earth I'd rather dab with than you."

A sign of true love! It's kind of amazing thinking about how 15-year-old Frankie is all grown up, and not the young kid you picture when you hear his name. Time sure flies.

MORE: SHOCKING THEN-AND-NOW PHOTOS OF YOUR FAVORITE STARS' YOUNGER SIBLINGS

Click through the gallery to see more photos of Frankie with his girlfriend. Let us know if you think they're a cute couple in the comments!

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