As Smith performed at Moscow's Luzhniki stadium, giant screens laid out on the pitch showed images of soccer players and the colours of the Croatian and French flags - the two teams who face each other in the final.
Smith was joined on stage by Nicky Jam, a U.S.-born singer with Puerto Rican roots, and by Era Istrefi, a pop singer who describes herself as Albanian Kosovar. Both artists had featured with Smith on the "Live It Up" single.
The performances were a prelude to France and Croatia's players taking to the pitch to begin their final match, in front of a packed crowd at the 80,000-seat stadium.
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