Here is a tribute page about Alice & Ellen Kessler. They are twin sisters who played Vegas and did a cover version of "Johnny Angel" (?!?) on their way to becoming singing stars in Italy and Germany. Warning, English mangled freely!
Or you could try this Wikipedia entry in English, if you like.
Technorati: Kessler+twins Die+Kessler+Zwillinge Alice+Kessler Ellen+Kessler