This is the correct spelling. It's the crème de la crème of phrases, UNLIKE WHEN RYAN HEINTZ SPELLED IT "CRIM DELLA CRIM", THAT IS WRONG. Crim della crim is wrong.
A term used by an evil French teacher, creme de la creme is a scar on the minds of hundreds of children. Perfection is not enough for this teacher, since she wants the de la creme de la creme de la creme de la creme de la creme de la creme of students.