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Looking for the song in a Lacoste ad which is currently airing in near every commercial break on MTV europe - it*s a female singer and uh... Thats about all I know.
If it is the film currently on Lacostes own website that you mean, then the singer is Natascha Thomas - yaknow singing "I don*t wanna believe it*s over now... Nanananana" etc.
Her site (german) is here,
<!-- BBCode auto-link start -->http//www.natasha-thomas.de/<!-- BBCode auto-link end -->
and you can doublecheck it*s the right girl by watching the Lacoste ad under advertising at
<!-- BBCode auto-link start -->http//www.lacoste.co.uk/<!-- BBCode auto-link end -->