John Mayer and 'Camp Rock' star Demi Lovato have been tweeting at each other!

Mayer wrote on his Twitter page Thursday: "I have 'La La Land' by @ddlovato stuck in my head. Actually, it's not stuck. I'm choosing to sing it. B section is sophisticated." He added to her: "You're going to make lots of records, I can tell."

Demi tweeted back: "THANK YOU. You're so awesome." And: "That is quite possibly the best compliment I've received in this business. Thank you so, so much..... !!!!!!"

John replied: "Welcome. Write one song at a time, never apologize for any of them, ever. From 'Wonderland' to Trio stuff, they're all my kids."

And Demi responded: "See, That's exactly what I needed to hear today. Wow. If that's not inspiration, then I don't know what is! You're incredible :D"