Celine Dion AND Coeur de Pirate on the same album. Yep, it's possible, in fact, it was already released. Because of the Jazz Festival in Montreal, a compilation came out featuring jazzstandards by several singers from Quebec, ranging from Dion to Stephanie Lapointe, and from Jean Leloup to Coeur de Pirate. All in English, alas. Beatrice/CdP does a beautiful cover of Someone to watch over me. A song that was covered many many times, great versions by Amy Winehouse, Frank Sinatra and the late great Ella Fitzgerald.
Coeur de Pirate - Someone to watch over me