Are Demi Lovato, 18, and Ryan Phillippe, 36, Hooking Up?

Despite an 18-year age difference, the Disney starlet and Lincoln Lawyer actor were reportedly "hot and heavy for a while"

Demi Lovato may be a resilient "skyscraper," as she says in her new single -- but she's still just a teenager. So isn't she a little young to be dating 36-year-old Ryan Phillippe? (Or rather: Isn't Phillippe a little old to be dating her?) We'd have thought so, but according to E! News, the 18-year-old Disney starlet and Lincoln Lawyer actor have been quietly seeing one another.

The source claims that Lovato and Phillippe started out as a casual fling, but that things quickly got "really hot and heavy for a while." Then Phillippe had to go and put a damper on things by having a baby with 21-year-old ex-girlfriend Alexis Knapp. Though Phillippe has yet to take a paternity test to confirm that he's the child's father, he was by Knapp's side in the hospital room when she gave birth to a baby girl named Kai in early July.

"It kind of threw her for a loop," says the source, adding that Lovato didn't know that Phillippe was going to be a father "until it basically happened." (So "threw her for a loop" would be an understatement, right?)

Since the birth of two-week-old Kai -- which coincided with Lovato's promotional campaign for "Skyscraper" -- the couple has reportedly cooled it. While E! seems to be holding out hope for the pair, a source at Us Weekly implies that the relationship may be dunzo, since "they were just hooking up" and "it was nothing serious."

In addition to the age difference, the timing of the relationship is certainly enough to raise eyebrows. Not only did Lovato get out of rehab mere months ago, but she was also reportedly dating Wilder Valderamma up until June -- which is also when Phillippe is said to have split with on-off girlfriend Amanda Seyfried. But in the past few weeks, Phillippe has been supporting Knapp through the final stage of her pregnancy, even acting as her labor partner for the actual birth. So when did Phillippe and Lovato find the time to start dating?

Honestly, they may not have. A source tells People not to believe the hype. "This is not true," the insider says of the hookup rumors. "He's totally single."

Either way, if Phillippe and Lovato do become an item, it wouldn't be the first time a sweet teen starlet hooked up with a questionably older man. Taylor Swift and John Mayer, we're looking at you!

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