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Will Smith, this is why we love you.

Saturday night at Gabrielle Union's 40th birthday party, the Fresh Prince himself hopped on the mic.

Much to the delight of the cheering crowd (and all of us watching online), the 44-year-old star freestyle-rapped, then broke into his 1991 hit "Summertime" and the iconic Fresh Prince of Bel-Air theme song. He had a little help from producer Doug E. Fresh, who provided the beat.

Earlier this year, Will delighted Graham Norton's audience with a performance of the Fresh Prince theme.

We hope Willow and Jaden realize just how cool their dad is!