Zac Efron joins cast of 'Baywatch' movie

"Welcoming my dude @ZacEfron to #BAYWATCH. Our movie will be big, fun and RATED R.. Like me when I drink," Johnson tweeted.

The film is based on a classic TV series of the same name. The original beach lifeguard series starred David Hasselhoff and Pamela Anderson. It's unclear if any of them will appear in the big-screen version.

Efron, 27, was last seen in R-rated comedy 'Neighbors' and is expected to return for the sequel. He will next star in 'We Are Your Friends', 'Dirty Grandpa', and 'Mike and Dave Need Wedding Dates'.

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