Rofl... I don't know if I should bleach my eyes or continue laughing. xD
Must try this for myself.
... in the morning.
EDIT:
Well, here's Fugly... Beautiful as always... o.o

She had twins with some random townie. They both turned out horrendous.

Handsome was the least ugly of the two, so I grew him into an adult.

And figured it was about time I threw in some genes of my own sims.

They had twins.

Don't let above picture fool you, Snow is awfully ugly. @.@

Rose was sort of okay as an adult.

And that's as far as I got, since the game kept crashing when she was about to give birth. After three times I got fed up trying. xD
EDIT 2:
Since Rose was obviously a dead end, I made Handsome have another kid with this lady.

That resulted in Cloud. Now Cloud suffers from freaky eyebrows of doom.

I aged him up a little, and he had a kid with another random sim. Meet Beauty. Unfortunately she inherited the eyebrows of doom.

I grew her into an adult.

Then she had a kid with some random sim. When I saw Heaven, I was quite confident I'd never be able to breed the fug out.

But then her kid Light came along. I have no idea how I managed to breed the eyebrows out, but that's okay.

Light was quite handsome.

But I wasn't finished yet, so I threw in my love Romulus.

This resulted in Shine.

At this point, I managed to breed the fug out. But Shine had a huge nose, so I went on for one more generation.

I threw in Holly.

And then Morning came.

Now, look me in the eye and tell me she's not pretty. xD

Nose is all normal, too.

It took a long long time, but I managed. Might have got there faster if Rose had cooperated.
EDIT 3: Hm, I think I might as well have stopped at Light. So, at 6 generations, the fug was gone. At 8 generations, the sim was the way I wanted her to be.
Strange none of them inherited Fugly's lips... And lol at Fugly having no nose and Shine having a huge one. xD