The allegations about a possible relationship between the two prove to be untrue.
Media speculated that Demi, who turns 19 next month, and Ryan, 36, have been secretly dating in the past months.
However, a source now tells People that the rumors are fake.
“This is not true. He’s totally single,” the insider says.
Ryan Phillippe recently became a father for the third time after his ex-girlfriend, topmodel Alexis Knapp, gave birth to daughter Kai earlier this month.
Lovato has been busy working on her latest single and video for “Skyscraper.”
Neither has commented on this subject.