The duo shared the news with their Instagram followers overnight, posting the same photo of her incredible double band engagement ring.
"I said yes," Sophie captioned the image, while Joe wrote the near-identical "She said yes."
Fans and celebrities alike flocked to Instagram to wish the couple well, with stars including Nina Dobrev, Sara Sampaio, Emilia Clarke, Maisie Williams and Jaimie King showing the newly-engaged couple love.
Joe's younger bro Nick Jonas also shared a picture of 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."
28-year-old Joe and 21-year-old Sophie have been dating for almost one year now, after knowing each other as friends for some time beforehand.
Congratulations to the happy couple!