Atlanta-filmed "Dirty Grandpa" with Zac Efron/Robert DeNiro due for a January release

FILE - SEPTEMBER 17: Actor Zac Efron completed a stay in rehab five months ago. CANNES, FRANCE - MAY 24: Actor Zac Efron attends the "The Paperboy" photocall during the 65th Annual Cannes Film Festival at Palais des Festivals on May 24, 2012 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images) Getty Images

Credit: Jennifer Brett

Credit: Jennifer Brett

FILE - SEPTEMBER 17: Actor Zac Efron completed a stay in rehab five months ago. CANNES, FRANCE - MAY 24: Actor Zac Efron attends the "The Paperboy" photocall during the 65th Annual Cannes Film Festival at Palais des Festivals on May 24, 2012 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images) Getty Images

The locally filmed Zac Efron-Robert DeNiro comedy "Dirty Grandpa" is due for a Jan. 22 release.

FILE - SEPTEMBER 17: Actor Zac Efron completed a stay in rehab five months ago. CANNES, FRANCE - MAY 24: Actor Zac Efron attends the "The Paperboy" photocall during the 65th Annual Cannes Film Festival at Palais des Festivals on May 24, 2012 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images) Getty Images

Credit: Jennifer Brett

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Credit: Jennifer Brett

The movie, pairing Efron as a straight-laced guy tasked with trucking his lewd and lascivious gramps, played by DeNiro, down to Florida. All sorts of hijinks ensue.

The movie filmed in metro Atlanta and Tybee Island, where Chris Evans is currently filming "Gifted."

 More recently, Zac has been back in Atlanta filming "Neighbors 2."