VIDEO: Johnny Depp Promotes Rum Diary by Jamming with ZZ Top Frontman

While at the Austin Film Festival to pimp this week's Hunter S. Thompson adaptation The Rum Diary, star Johnny Depp grabbed his guitar and took to the stage with Billy Gibbons of ZZ Top for a surprise rock show. Because that's how you get the kids to come to your new period movie, folks! Viral marketing meets rock 'n' roll! Johnny Depp can do no wrong! Watch the video and stick around for more Buzz Break.

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