'Dirty Grandpa' Release Date, Trailer, Cast News & Update: Zac Efron Shows Hot Bod in International Movie Trailer With Robert De Niro

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Zac Efron shows his finely chiseled body in the international movie trailer of the upcoming movie "Dirty Grandpa," also starring Robert De Niro. Watch the trailer below:

In the trailer, we learn that Efron is playing groom-to-be Jason Kelly who will be married to a controlling wife, Meredith (played by Julianne Hough). The two are scheduled to be married in a week and the marriage will bring Kelly the partnership at the law firm.

He is persuaded by his grandfather Dick, played by De Niro, to go on a road trip to which Efron's character belatedly finds out that they are going to Daytona Beach in Florida during Springbreak. We see Efron's hot body on the second half of the trailer as he runs around stark naked with nothing on but a stuffed animal to cover his crotch at a party.

In the German trailer, more of what happened on the party was revealed. It looks like Efron's down on his luck as the events of last night led him to wake up with nothing on with the said Bumblebee stuffed toy after he got drunk and apparently smoked crack. A kid comes over and tries to pry the stuffed toy off of him and according to the Hollywood Life, a bit of Efron's family jewels were revealed. Some images shared by Mirror shows Efron will likely be half naked for a part of the movie.

Watch the German trailer here:

Here is the official synopsis for the movie: (via Collider)

"Jason Kelly [Zac Efron] is one week away from marrying his boss's uber-controlling daughter, putting him on the fast track for a partnership at the law firm. However, when the straight-laced Jason is tricked into driving his foul-mouthed grandfather, Dick [Robert De Niro], to Daytona for spring break, his pending nuptials are suddenly in jeopardy.

"Between riotous frat parties, bar fights, and an epic night of karaoke, Dick is on a quest to live his life to the fullest and bring Jason along for the ride. Ultimately, on the wildest journey of their lives, "dirty" Grandpa and his uptight grandson discover they can learn from one another and form the bond they never had."

"Dirty Grandpa" is set to be an R-rated comedy, according to Movie News Guide and it is set to be released on Jan. 22, 2016 in the US. It also stars Aubrey Plaza, Adam Pally, Zoey Deutch, Henry Zebrowski, Jason Mantzoukas and Dermot Mulroney.