Demi Lovato Says Joe Jonas Tries to Read Her Thoughts

Though they've only recently admitted they're dating, Demi Lovato and Joe Jonas are already one of those couples who finish each other's sentences.

"He has this thing where he tries to say everything that's coming out of my mouth," Lovato tells Radio Disney's Ernie D, laughing. "But yeah, he doesn't know what I'm about to say."

Lovato and Jonas, who performed the duet "Make a Wave" on American Idol Wednesday, met on the set of Camp Rock in 2007, and Lovato toured with the Jonas Brothers the following year. The two quickly became best friends.