Amy Winehouse has pocketed £1million with a 40-minute gig for an unnamed Russian oligarch.
The 27-year-old singer was flown in by private jet and stayed in a top hotel for the performance on Friday.
Among the guests were billionaire Mikhail Prohorov and Sergei Kapkov, head of the Russian Football Association.
Winehouse, minded by 50 bodyguards, sang a selection of her hits from the top floor of a closed-off shopping centre.
Her spokespeople last night denied allegations that she appeared drunk.
A source close to the Rehab singer told the Sun she is feeling good and looking forward to getting her career back on track.
'She is determined to go down in history as a world-class performer, not someone who ruined a spectacular talent through drugs,' the insider said.
Winehouse is set to release her third album in January and is expected to be a major draw on next summer's festival circuit.