As an impartial third-party, I have looked into the Jenny Lewis matter.
I have taken internet pictures into account and can render judgement:
This Jenny Lewis is not pretty. I do not find her sexually attractive.
She is not UGLY, exactly, but is very mannish in the face and her skull seems to have been mushed around a bit when she was young and she got stuck that way, with that pronounced "Skeletor" like facial structure that is pretty much not attractive to me.
She looks a good deal like one of those transsexual dudes who got the start on his/her hormones in their teens so that his/her stayed boyish and developed some female secondary traits naturally at the end of his/her growth cycle, such as slender shoulders, not much of a male brow, wider hips, some natural bust and butt growth, etc.
And yet there is also a weird boyish maleness remaining that is completely unattractive to a straight dude such as myself and probably most pinning-the-back-end-of-the-Kinsey-scale straight dudes.
Not that there is anything wrong with hanging out in the middle of the scale there and digging boyish ladies or girlish men... but it pretty much isn't within my range.
And the eerie thing is that... she isn't a MANLY kind of unfeminine. She is definitely is a BOYISH kind of unfeminine. It is not like a hearty mannishness like the lady from THIRD ROCK FROM THE SUN or the lady from THAT 70S SHOW.
It is an off-putting boyishness that allows her to be not at all pretty or sexually attractive without being ugly in any measurable way.
Such as you look at her and say "Huh, she looks like a completely presentable 13-year-old boy. I am not repulsed but I am not aroused in any way."
This is my verdict after seeing, like, four pictures of her.