Lucy O'Donnell was 4 years old when her classmate at nursery painted a picture of her, surrounded it with stars and squiggles and took it home to show his parents."It's Lucy in the sky with diamonds," Julian Lennon told his father, inspiring one of the Beatles most enigmatic songs and carving his friend a slice of musical immortality.Lucy O'Donnell was 4 years old when her classmate at nursery painted a picture of her, surrounded it with stars and squiggles and took it home to show his parents."It's Lucy in the sky with diamonds," Julian Lennon told his father, inspiring one of the Beatles most enigmatic songs and carving his friend a slice of musical immortality.