Rock on!

Maddox Jolie-Pitt had quite the shopping spree with dad Brad Pitt Wednesday when the 10-year-old and his famous father hit up a Hollywood Guitar Center store to snag new music equipment.

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Dressed entirely in black, papa Pitt, 48, went relatively incognito for the afternoon outing with his and Angelina Jolie's oldest boy.

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"He spent time with his son looking at various guitars and the kid seemed genuinely interested," an eyewitness tells Us Weekly of the duo's day out.

Leaving the shop with a guitar and amplifier, Pitt and Maddox "were like a regular father and son," said the source. "Maddox was a fun kid who looked like a little rock dude."

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Pitt's outing with Maddox capped off a fun-filled week in the Jolie-Pitt household. On Sunday, Pitt attended the 84th annual Academy Awards with an Atelier Versace-clad Jolie on his arm. Up for Best Actor honors for his work in Moneyball, Pitt lost out on a trophy this year to The Artist's Jean Dujardin.

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