Audrina, 32, dated the 35-year-old musician in 2010 for five months, documenting their relationship on The Hills before going their separate ways.
A source confirms to People that the pair were spotted at the Stagecoach 2018 country music festival over the weekend.
“They’re dating,” says the source. “They've been spending a lot of time together recently and are having a good time."
The pair also seen together on Audrina’s stylist Joey Tierney’s Instagram story.
The news comes eight months after Audrina filed for divorce from husband Corey Bohan, whom she married in 2016 and shares daughter Kirra.