In October 2011, commuter Lisa-Marie O'Keeffe was excited to spot a familiar face on the Tube. Rihanna was on her way to a gig at the o2. She said the star was telling excited fans to "hold on tight" and was "being very motherly".
Another commuter, Adrienne Amando, said Rihanna was with her minders and manager, saying "she was so gracious and so humble and so lovely, it was wonderful"
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Police have released an e-fit of a man suspected of attacking her.
The force has been tweeting after carrying out a series of dawn raids.
Adenike Akingbogun made the dangerous manoeuvre after ignoring the crossing lights and driving onto the tracks.