This video posted on Youtube - and shot by Will Smith himself - shows school-girls in Lambeth going wild for their Hollywood visitor.
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Elena Veronica Ciochina left her home in Newham on Saturday night and hasn't been seen since.
The internet's favourite grumpy feline has flown over from the US to take in the sights of London but looks less than impressed.
Nero jumped a fence in Watford which had a 12-foot drop the other side.