The "Stone Cold" singer posted an Instagram Story of her cuddling up to the 37-year-old actor.
"Best of friends no matter what," she simply captioned their picture.
The two reunited at a barbecue at Lovato's house to celebrate LA Pride weekend, reported E! Online.
Lovato's post comes just over a year after she and Valderrama announced that they had called it quits.
After their split, Lovato was linked to UFC fighter Luke Rockhold and then MMA fighter Guilherme Vasconcelos.
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