Imagine you're sitting on the tube, minding you're own business when suddenly - the doors open and Rihanna gets on.
Just a dream?
Not for commuters in London when the 23-year-old hopped on the Jubilee underground line to get to the 02 Arena for her concert.
Rhi Rhi used her own Oyster travel card to take the journey when she joined the carriage at North Greenwich station.
The Man Down singer then hopped off the train to perform a killer show.