I don't see how anyone could possibly mistake her for a boy.
I can. It's a combination of being a little bit stupid, trying really hard to see it, and a dash of "wah, someone isn't conforming to my particular stereotype of gender appearance."
WORDS MEAN THINGS! Also, before you come to bitch about a plot hole, rewatch the show/movie.

I think that her hairstyle suits her just fine, she looks great. There's nothing masculine about her features. Quite the contrary, she's very girly, and very pretty, in fact. I don't see how anyone could possibly mistake her for a boy.

Great haircut

I hate her haircut does not suit her

Great haircut

I agree. That hairstyle simply doesn't suit her. When I first started watching, "Blue Bloods," I wondered,
Wait. Is that a boy or a girl?

@Bo-Ulrich.finally someone gets it right. However LB didn't "invent" the flapper girl look, she perfected it..:). I'm of the opinion that Sami is a lovely girl, wearing a hairstyle that few girls or women can pull off, but not just another pretty face. I just saw Detachment, and was blown away by her performance. So being the curious george that I am I looked for some recent interviews, and discovered that she is light years ahead of her age with the way she approaches her career as well as her life.
"Religion is the opiate of the people" - Karl Marx

Samis hairstyle is not new. Maybe a little shorter over her forehead this is the hairstyle made famous by movie icon Louise Brooks. And she, ms Brooks, invented it.

She does indeed have striking features. She's gorgeous. Beautiful brown eyes, cute eyebrows, full lips and I like the pixie cut. She is exactly as you say. adorable!

My guess would be she either A) likes her hair short and is willing to get extensions for roles that call for them or B) keeps her hair short because for some reason Hollywood believes that ingenues have long flowing hair and edgy, serious girls have short hair. She might have been encouraged to get her hair cut to help her get roles like the one she got in Detachment.
http://stanfordwank.livejournal.com
stanfordWANK: Who doesn't like it rough?

Her hairstyle is most likely not her choice. Most commercial entertainment companies want androgyny in their product. This is just one of the many stages the product will go through as it is mass marketed.

I couldn't 16d0tell if she was a boy or a girl the first time I watched the show. I hate the haircut. Some people look good in ultra short hair, but not her.

i thought it was justin biber
I'm taking my talents to South Beach.

When her and Danny were on screen together I thought I had switched over to lord of the rings by mistake.

She looks just like the kid who plays Shane Botwin on Weeds, I'm surprised that they aren't related.

Not at all

when Emma Watson cut her hair to look like a boy she lost her cuteness, same with Jennifer Lawrence. Seriously wtf?!
"My favorite number in the whole world is 5318008."

Leave her be. A lot of people, myself included, like that look, though some can't admit it. She also looks like those recent candid pictures of Emma Watson in her short cut, which isn't too shabby either.

It looks like she has a mullet.

I agree about her hairstyle on Blue Bloods. The hairstyle in her IMDb photo looks much nicer.

No kidding, the hair is a wreck, but a better question is:
How does one get such an overt dominant lesbian vibein childhood?

Same here! I have never seen this show & just happened upon an episode tonight I saw her character on screen & wondered is that a boy or a girl??? So I came here, because I was so confused, lol. I guess she's a girl, but wow that's a bad haircut
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kinda cute.. how old is she??