Not even close to "exactly". They both talk while holding the corners of their mouth together and have the same general coloring, but that's about all.

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Did no one notice that she looks
exactly
like young Geena Davis? In, say,
Beetlejuice
?
http://ia.media-imdb.com/images/M/MV5BMjEzNzUwNTAwOF5BMl5BanBnXkFtZTYw NzM0Mzg3.V1__SX1537_SY747.jpg

*Phoebe

I think she looks like Pheobe Tonkin

From Gilligan's Island? Seriously?

I totally agree. Reminds me of Dawn Wells, the younger British version.

I think she looks like a cross between Christina Ricci,Tiffani Amber Thiessen and Lily Collins.

I think she looks more like dawn wells then the others
http://3.bp.blogspot.com/-UJ4TexPYQJM/UPlng36HUeI/AAAAAAAAdOw/UnwZIhnMo-A/s640/dawn+wells+6.jpg

Jenna may mildly resemble Christina but Jenna is so much better looking.

She's a little bit look like Christina Ricci, only better.

She is adorable! I think she looks like a cross between Christina Ricci and a younger Helena Bonham Carter.

I think she looks a bit like Fiona O'Carroll from Mrs Browns Boys

I was just watching Jenna in this youtube video
"Doctor Who: Matt Smith and Jenna Louise-Coleman's love letter to fans!" and she reminded me strongly of Nina Dobrev from The Vampire Diaries in both looks and manner. She strikes a pose and I immediately thought of Nina Dobrev.

I didn't put the connection together until the episode I watched last night, but it had definitely been driving me crazy. Then it hit me, and when I said it out light that she looked a lot like she could be Christina Ricci's sister or something, my wife said "That's who she reminds me of! Thank you, it was driving me crazy!".
Jenna-Louise is just a tad cuter though. No offense to Christina, who is quite cute as well.

I saw a short interview with her somewhere recently, and she was asked if there were any celebrities she had been physically compared to in the past. A strange question, I thought, but her answer was "Oh yeah, I've been compared to Christina Ricci for years".

That's what I thought, too! I had to double-check the credits to make sure it wasn't her. Great minds think alike!
Everyone deserves a chance to fly

Ricci's still young enough to be a Dr Who companion nowshe's nowhere near what you would call middie-aged,anyway. I don't think this actress looks like her, but they do have similarly-shaped faces.

Yes, I agree. Like others, I did a double-take when I first saw her in this role in 'The Snowmen'. Not only in appearance, but also, that sassy attitude that I've always found such an appealing Christina characteristic.
Ricci would have made a great Dr Who companion ealier on in her career!

Summer Glau was who I though when I watched the Doctor Who Snowmen. And very much so.

This one of the first things i thought when seeing her in Doctor Who. Also kinda reminds me of Summer Glau a little but.

She also looks a lot like Dia Frampton

Definitely a resemblance. I thought it as soon as they showed her on Doctor Who!

I just saw her in a doctor Who episode and in the first scene she appeared in I had to look twice. Spitting immage.