EXCLUSIVE: Adam Pally and Jason Mantzoukas have joined the cast of the raucous comedy that QED International is financing and selling outside the US, where Lionsgate will distribute.

Production began this week in Atlanta on the story starring previously announced Robert De Niro and Zac Efron about a man in his final days of bachelorhood who drives his grieving grandfather to Florida and learns his elderly relative is a full-on hedonist.

Adam Pally and Jason Mantzoukas (pictured) join a confirmed cast that includes Zoey Deutch, Aubrey Plaza, Julianne Hough and Dermot Mulroney.

QED introduced the project to the market in Toronto last autumn and cut a deal with Lionsgate to distribute in the US and UK. Lionsgate has set an August 12 2016 US release date.

Dan Mazer directs and the producers are Bill Block, Barry Josephson, Jason Barrett and Michael Simkin.