The singer was spotted with Valderrama at Disneyland recently, sparking rumours of a rekindled romance, but she isn't going on record to confirm she is dating the That '70s Show star.
Talking about the story during an appearance on Ryan Seacrest's radio show on Wednesday (04Sep13), Lovato said, "I share so much with the world that I like to keep some things private and it's something I don't want to talk about.
"You can do whatever you want. You can be seen holding hands. You can be seen wherever, but it doesn't mean you have to talk about it or acknowledge it because it opens up a can of worms."
But she did acknowledge that Valderrama is a great guy, adding, "He is an incredible human being and I am honoured to have him in my life."