Mel Gibson`s ex-girlfriend and the mother of his eighth child – Russian pianist Oksana Grigorieva will perform in Moscow. Less than a month after the report of her splitting from baby`s daddy Mel Gibson came out, the Russian singer Oksana Grigorieva is back entertaining audience in Moscow. News of the split sparked reports that Grigorieva`s performance at a charity concert in Moscow would be canceled, but Grigorieva has assured fans the show will go on. She says, `Children`s pain hurts me too. I always wanted to help children through music.` Pictured: Oksana Grigorieva posing at the press conference devoted to her performance at a charity concert in Moscow.