The "Modern Family" star took to Instagram on Tuesday to reveal the exciting news.
"That can't eat, can't sleep, reach for the stars, over the fence, world series kind of stuff ✨❤️ @wellsadams," she captioned a series of photos from the couple's special moment.
In one picture, Adams, 35, is seen getting down on one knee and popping the question to a shocked Hyland, 28.
The next photo features the actress and Adams proudly showing off her diamond sparkler.
The star also shared two pictures of the pair kissing and another of them holding each other closely.
Adams also posted the news to his account with a sweet one minute clip of the couple.
"I’ll be Johnny, you be June. But forever 🎶- Drew Holcomb & The Neighbors," he captioned the video.
Adams and Hyland started dating in late 2017.