John Mayer Says Demi Lovato Has A 'Huge Career' In Her Future

He offers his onetime collaborator some advice: 'Just keep writing, just keep working, just keep developing.'

Demi Lovato and John Mayer have never been shy about sharing their love with the world. After the pair had an ongoing Twittermance earlier this year, Mayer worked with the Disney princess on the track "World of Chances" from her Here We Go Again album.

But Mayer didn't feel pressured to return the favor when it came to his November release, Battle Studies. "I like Demi a lot," Mayer said. "It's not a matter of obliging her. I look at what makes the best song, what makes the best sound, what makes the most timeless thing."

Regardless of that decision, he does think if Demi keeps working as hard as she does, she'll have a lot of success. "I think Demi has a huge career in front of her ... depending on the decisions she makes in her life," he explained. "And when you're young and you're a star, my thing for her is like, just keep writing, just keep working, just keep developing."

Mayer said Demi needs to try to forget that the world is watching during her evolution as an artist. "You have to keep developing, even if you're out in public. It's really difficult to be seen in the public and still continue to be vulnerable as an artist," he said. "But when you're 16 or 17, you have to. ... You gotta keep learning, [even if] people are watching you."