Make-up may do wonders but deep inside, you are who you are.

A Jay venturing into a yard where Peacocks used to walk, found
there a number of feathers which had fallen from the Peacocks
when they were moulting. He tied them all to his tail and strutted
down towards the Peacocks. When he came near them they soon
discovered the cheat, and striding up to him pecked at him and
plucked away his borrowed plumes. So the Jay could do no better
than go back to the other Jays, who had watched his behavior
from a distance; but they were equally annoyed with him, and
told him:

"It is not only fine feathers that make fine birds."