It wasn't to make herself ugly, it was because Marilyn had like the most famous mole ("beauty spot") of all time.
Who cares? All of this "iconic" bs is so annoying.
The topic is who's prettier, not who is more of an icon. Which is a stupid question to begin with, as they are both icons.
Prettier here than any of the Madge pics with the mole and unfortunate nostril shaping (not to speak of the unforgivable grand tooth canyon). Gaga wins!