"The Rolling Stones have been named the most expensive musical act to perform at weddings.The poll, which was carried out by Living TV for its Four Weddings series, included celebrities such as Sir Elton John, Leona Lewis and Jennifer Lopez.The rock group, consisting of Ronnie Wood, Mick Jagger, Keith Richards and Charlie Watts, charge up to ??5 million to perform at wedding receptions.Second on th" . . . . .