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The exes, who dated in 2010, joined other young celebrities such as Allyson Felix, Meaghan Martin and Tyler Blackburn to film promotional spots for Acuvue's 1-Day Starts contest at a private residence in Malibu back in February. The sighting of Lovato, 19, and Jonas, 22, in the same place at the same time led to speculation that the two were getting back together.
But Lovato set the record straight. "We've been really good friends for so long. So it's been cool hanging out with him again," Lovato told Us Weekly, confirming that "nothing romantic" was going on with them. "I didn't even know that was a rumor!"
Lovato was also thrilled to work with Martin, who played her rival in the Disney movie Camp Rock.
"It's cool because we've gotten to work together before, and now we're working together again. It's kind of like a reunion," she said. "So it's nice. It's really fun."
And Jonas agreed. "I've been lucky to be able to work with a lot of great people in my life, two of whom are Demi and Meaghan...It's been a while since I've seen them," he said. "We've all been kind of on different paths, but I see them at award shows and things like that. And any time we see them, it's like family reunion. We have catch-up time and reminisce."
The five stars are all set to mentor the winners of the Acuvue-sponsored contests, which requires users to submit a one-minute video sharing their dreams.
"I've never really mentored anybody before other than like my little sister, so it's going to be exciting," Lovato said.