Sources close to the couple tell The Blast the engagement party in NYC will be a celeb-packed rager with "Game of Thrones" co-stars, DNCE bandmates, and the rest of the Jonas bros.
We're told the night will begin with an intimate 30-person dinner at an upscale restaurant in the city, and then will really kick off at a nearby venue for a full dance party.
Our sources say around 100 people are invited to the bash, which will feature a DJ, and of course a photo booth.
Jonas popped the question to the 21-year-old "Game of Thrones" star a few weeks ago with a massive rock. The two have been dating since last fall.
Unclear if the reception will also have Littlefinger foods ... and hopefully Arya isn't catering.