The couple shared the happy news with corresponding Instagram posts on Sunday. They each posted an image of the Game of Thrones star with her hand on top of the singer’s, showing off the stunning engagement ring against their black clothes.
“I said yes,” Turner, 21, captioned the photo. Meanwhile, the 28-year-old singer wrote, “She said yes.”
“YES!!!” Nick wrote, while Kevin similarly chimed in with, “Yeah!!!!!!!”
Nick, 25, then shared the photo of the ring on his own Twitter page to further congratulate the couple. “Ahh! Congratulations to my brother… and sister in law to be on your engagement,” he said. “I love you both so much.”
Jonas and Turner have been dating since last November, after they were spotted acting cozy at a concert in the Netherlands. They also spent Halloween and Thanksgiving weekend together. Since then, the couple has been going steady, and was recently snapped sharing some sweet PDA while out and about in Los Angeles.
The duo didn’t become Instagram official until January, when Turner posted a picture of Jonas on a boat holding a cigar with the simple caption “Miami Daze.”
RELATED VIDEO: Joe Jonas and Sophie Turner Spotted Getting Cozy in the Netherlands
As PEOPLE exclusively reported in June, a source close to the musician said that “Joe is taking the relationship very seriously” and Sophie is “different from the other girls he has dated.”
The couple have kept fairly tight-lipped about their romance.“I’m in a relationship, but it’s a very private relationship,” Turner told the U.K.’s Sunday Times in July.
“I very much isolated myself for a while and forgot what was fun. Going out with friends, going out to eat, not really having a care,” she told the publication. “And people I’ve met recently in my life have drawn me out of that.”
She continued, “It really helps you own those insecurities. The things I tortured myself about before, I can forget about.”
According to the British starlet, she’s in a much more positive place in life than she was before.
“I’m happier than I’ve been in a very long time,” she said.
“You realize that you’re not going to see each other all the time,” she said, and added, “And you don’t feel like a jerk when you’re like, ‘My publicist says I can’t do this…’ “