The singer praised fans who had waited nearly a year for the postponed show to go ahead.
The footage shows the anonymous British artist working around Kyiv - but never reveals his face.
Memorable acts from the song contest's history performed at a special concert in The Netherlands.
The 18-year-old Coronation Street actress will play Ruby Sunday in the long-running sci-fi drama.
The US pop star says she had been told Ticketmaster could handle demand, despite the chaos this week.
The graffiti artist called on shoplifters to visit a London branch of Guess in retaliation.
The BBC's technology editor looks at claims that Twitter may be heading for calamity.
The musician had been signed to Motown Records and worked with artists including 2Chainz and Future.
Both men say they have had encounters where people assume they are 'the other' Brian Cox
Donnell Russell receives 20 months in prison after pleading guilty to harassment and intimidation.