I believe Hélène Segara has not been mentioned yet. Here's a duet with Laura Pausini.
Laura Pausini & Helene Segara - ON N'oublie Jamais Rien
<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/A1dLqAqiSKk"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/A1dLqAqiSKk" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>