what's the name of this movie?

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I want to know the name of a movie where David Duchovny's wife dies and he doesn't want to go out with anyone. Then his best friend sets up a date for him in an Irish-Italian restaurant where he falls in love with the waitress (who is the owner's grandaughter). She is really insecure and hasn't dated because she was really sick and had a heart transplant about a year a ago. The start dating and fall in love, but she discovers that the heart she received was the heart of Bob's dead wife. It's a wonderfully romantic and funny movie, but I don't know the name!! Does anyone know it?