Zac Efron and Robert De Niro are attached to star in "Driving Dick Kelly," an adult comedy formerly known as "Dirty Grandpa" that Dan Mazer will direct for Bill Block's QED International, TheWrap has learned.
Barry Josephson is producing the project, which was previously set up at Universal and is now being shopped to other studios.
John Phillips wrote the script, which follows a lascivious, recently widowed Army veteran (De Niro) who tricks his uptight grandson (Efron) into escorting him to Florida for spring break.
Efron recently starred in Universal's hit comedy "Neighbors" and is currently filming Max Joseph's DJ movie "We Are Your Friends" with Emily Ratajkowski. He's managed by Jason Barrett of Alchemy Entertainment.
De Niro, who's coming off the box office hits "Last Vegas" and "American Hustle," recently wrapped the boxing movie "Hands of Stone" with Edgar Ramirez and Nancy Meyers' WB comedy "The Intern" with Anne Hathaway.
Mazer co-wrote "Borat" and "Bruno" with Sacha Baron Cohen, and he also served as an executive producer on "The Dictator." He most recently wrote and directed the romantic comedy "I Give It a Year," which starred Efron's "Neighbors" co-star Rose Byrne.
QED's upcoming releases include Brad Pitt's WWII movie "Fury," Barry Levinson's "Rock the Kasbah" with Bill Murray and a pair of Richard Gere movies -- Andrew Renzi's "Franny" and Oren Moverman's "Time Out of Mind," which will screen this week at the Toronto International Film Festival.
CAA represents De Niro, Efron and Mazer, who is also represented by 3 Arts Entertainment and attorney George Davis.
Phillips, who also wrote the DreamWorks comedy "Who Invited Her?" and a draft of "Bad Santa 2," is represented by UTA and Underground.