Will Smith Raps Fresh Prince Theme Song For London Schoolgirls

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Will Smith turned lots of heads in London last week when he appeared at a school assembly and rapped the theme to the Fresh Prince of Bel-Air ... seriously.

The rapper / movie star visited St. Martin-in-the-Fields High School; he was invited by Streatham Member of Parliament Chuka Umunna.

Umunna joined him on the Fresh Prince rap. Check it out:

Smith was in the UK to watch his Jaden open for Justin Bieber's tour ... Will was not there when JB tried to beat the f--k out of a photographer.

Both Smiths costar in sci-fi blockbuster After Earth June 7.