And the crowd went wild!
It turns out the Hollywood hottie has a lot of tricks under his sleeves. Brad Pitt took the stage with Bruno Mars last Saturday at the Make It Right Gala in New Orleans, and the awesome twosome made an impromptu number the crowd will never forget.
The 28-year-old singer introduced Pitt, who received the warmest welcome from the audience, before he showed off his tambourine skills while Mars sang to James Brown's hit song "Sex Machine."
We're sure the guests at fancy event had no idea they'd be getting a special treat from the charity's founder. The World War Z star founded Might It Right back in 2007 to rebuild homes and healthy communities when Hurricane Katrina struck New Orleans.
This clip will certainly make your day. What are you waiting for? Hit 'play' and watch the video below!
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