Don't worry your head about it

Don't worry your (pretty little) head about it.

Rur. Do not worry about it. (Said condescendingly, and can cause offense.) Mary: How are you going to get another job if you don't start looking for one? Tom: Now don't worry your pretty little head about it. Just leave it to me. Tom: What are we going to do if we can't find an apartment? Sally: Don't worry your head about it. We 'll find one, one way or another.
See also: head, worry