The 23-year-old singer shared a picture of herself with the sleeping 35-year-old actor on Instagram, writing, "Slept in today so I didn't post my #NMM picture BUT I thought I'd make it up now with a cute/sneaky family photo."
Lovato and Valderrama have been together since 2010, but the singer told E! News there's "no rush" to marry in August. She gushed about the actor in an interview with On Air with Ryan Seacrest the month prior, saying she felt an instant attraction.
"I met him five years ago and we became close after that," she said. "I looked at him and was like, extremely attracted to him. Who isn't? When I first me him, I'm not shy [about] dating older men, and he was like, 'You're too young.' [But I'm] not anymore."
Lovato guest starred on Valderrama's El Rey series From Dusk Till Dawn in October, and released her fifth studio album, Confident, the same month. She will kick off her Future Now tour with Nick Jonas in Sunrise, Fla., on June 24, 2016.