U.S. singer Madonna performs in St. PetersburgST PETERSBURG, Russia (Reuters) - Pop star Madonna spoke out for gay rights at a concert on Thursday in St Petersburg, Russian President Vladimir Putin's home town, where activists say a law adopted this year to curb homosexual "propaganda" is discriminatory. Performing in black lingerie with the words "No Fear" scrawled on her bare back, Madonna urged the audience - most wearing pink wrist bands distributed at the door - to "show your love and appreciation to the gay community". "We want to fight for the right to be free," she said. ...