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Big Willie is taking Great Britain, all right.

Will Smith turned lots of heads at South London's St. Martin-in-the-Fields High School last week when he appeared at an assembly and rapped the theme to the Fresh Prince of Bel-Air, much to the delight of hundreds of screaming schoolgirls who requested the ditty.

Now that's gettin' jiggy with it!

The 44-year-old Smith, who starred in the sitcom for six seasons in the early '90s, showed up at the invitation of Streatham Member of Parliament Chuka Umunna.

The thesp was in the U.K. to watch his son Jaden open for Justin Bieber on the latter popster's European tour.

Both Smiths costar in the sci-fi blockbuster After Earth, which hits theaters June 7.