Selena Gomez Lights Up for New Paul Rudd Film

Selena also posted a photo with her co-stars Rudd and Craig Roberts and wrote, "Hi. This is the Fundamentals of Caregiving. Watch us in a theater soon. Well, let us shoot, edit, hopefully not re-shoot, then release it."

The Jonathan Evison novel of the same name was published in 2012 and tells the story of Ben Benjamin (Rudd), a man escaping divorce who just barely qualifies as a professional caregiver for a typical video-game-obsessed and sex-crazed teenage boy Trevor (Roberts), who has muscular dystrophy.

Gomez snagged the female lead role of Dot, an outspoken young woman full of sass, who hitches a ride with the pair during a road trip, and whose no-holds-barred attitude and lack of embarrassment about Trevor's condition causes him to develop a crush on her.

Prior to filming, Selena was spotted hanging out in the Dirty South with her rumored boyfriend Zedd. The pair enjoyed each other's company all weekend while also promoting their upcoming music collaboration on social media, however, a source tells E! News that Zedd is no longer in Atlanta.

—Additional reporting by Michelle Falls and Lindsey Caldwell

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