Pop star Lady Gaga sang John Lennon's 'Imagine' sitting at a flower-covered piano as the inaugural European Games got off to a glamorous start in the Azeri capital with a dazzling opening ceremony on June 12.
Reuters: Lady Gaga surprise guest at Games opening ceremony
US singer Lady Gaga performs during the Opening ceremony of the 2015 European Games on the Olympic stadium in Baku on June 12.
