"It's amazing!" she gushed to the Canadian entertainment show eTalk at Saturday's Nickelodeon Kids' Choice Awards. "It's a great feeling! When you're in love, you want the world to know!"
The couple have earned themselves a nickname that puts them on par with such major celebrity pairs as Brad Pitt and Angelina Jolie as well as Tom Cruise and Katie Holmes.
"They call us 'Jemi,' which I think is pretty funny," said Lovato.
Lovato, 17, also told eTalk that she gets stopped on the street by strangers who want to know what's going on with her beau, 20.
"It's really weird, because random strangers will be like, 'How's Joe?' " she said. "And I'm just like, 'What?' But it's fun. It's really special, and we're having a good time."
The pair met on the set of Camp Rock in 2007 and grew close the following year, when Lovato toured with the Jonas Brothers. Last week, they performed their duet "Make a Wave" on American Idol.