The pair announced their engagement overnight, taking to Instagram to share a photo of the spectacular ring.
28-year-old Joe, the lead singer of DNCE, captioned the image simply, "She said yes."
With 21-year-old actress Sophie backing up the claim with the same photo, writing: "I said yes."
Joe's younger bro Nick Jonas also shared a pic of Joe and Sophie's engagement announcement photo on Twitter.
"Ahh! Congratulations to my brother...and sister in law to be on your engagement," he wrote. "I love you both so much. @joejonas @SophieT."
The relationship was confirmed in December 2016 when a source told People, "They’re dating exclusively. He was playing the field, but he really likes her and is willing to settle down for her."
Since then, Sophie and Joe have adopted an adorable puppy together.
Congrats to the happy couple!