Robert De Niro and Zac Efron to Star in 'Dirty Grandpa'

Robert De Niro and Zac Efron are teaming up for a raunchy comedy in 'Dirty Grandpa'.

Dan Mazer of 'Da Ali G Show' fame will write and direct the Universal film, which QED is financing, reported Variety.

The film's story revolves around an uptight Efron, who right before his wedding, is tricked into driving his vulgar former Army general to Florida for spring break.