I was watching Ashes to Ashes and thought Keeley must be Kiera's sister. Came to IMDB to dig around and looks like I am not the first one !!!

I've been watching MI-5, and came here just to see if anyone else saw the resemblance. They even sound alike!
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I was thinking this all throughout Tipping The Velvet (which was lovely, I just finished watching it for the first time) as well. I agree that she looks like Keira Knightly but is prettier. I also think she is sexier and more charismatic.
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Just saw the promo of the new Upstairs Downstairs, where she bears startling resemblance to Kristin Scott Thomas, no? But I kinda see your point

What on earth are you lot talking about? If Keeley Hawes could hear you making comparisons with her and Miss Knightly I think she'd be horrified. Hawes is beautiful, glamorous and sophisticated. Some may argue Knightly is beautiful but glamorous would be questionable and she certainly isn't sophisticated. Hawes also carries off maturity and intelligence which, IMHO, Knightly doesn't.
Also I agree that she is far more like Kristin Scott Thomas. Another beautiful and sophisticated actress. Both are in a league above Knightly.

I agree there is a similarity, I thought it was the jaw line, and maybe there eyes. No effense to Kiera Knightly or any of her fans but I prefer Keeley Hawes, I thing she's awfully good at inhabiting a character and is very versatile.
In that picture you posted chislehurstbat yes I see the similarity but Kiera Knightly does look awfully slim. or is that just me?

Have a look here http://www.life.com/image/54955735
both ladies on one photo together. They could pass as sisters.

To be honest, I think she looks far more like Kristin Scott Thomas, but there we are.

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"Maybe I am just looking at her breasts :D"
With the red bra? That scene was beautifully shot
I saw a picture of these two together at PnP premiere, they actually don't 'look' that similar standing next to each other.

Just been watching some Ashes To Ashes episodes and was thinking more Rachel Weiss than Keira. But what do I know? Maybe I am just looking at her breasts

Totally agreed. The voice, way of speaking, jaw and eyes. Very Keira. Must have confused the beep out of Matthew MacFadyen in P&P.

I was thinking that too! she does look like keira knightly especially her mouth, but keely is much prettier and has a much nicer figure!!
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I have said this for so long, I said to my mother when talking about who she was, 'Oh, you know the one out of Spooks who looks like a prettier Keira Knightley?' and she knew exactly who I meant.
She looks a hell of a lot like Keira Knightley, except she has about a million times more talent and a body to kill for. I think it's their eyes and mouth that makes them look so alike.

My mum said that Keeley looked like Keira when we were watching Jonathan Ross too.
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I agree. I think it's their bone structure that is very similar and their eyes. They both could pass for sisters. Keira and Natalie Portman look very similar also. They were both cast in Star Wars when they were younger and I've read that their mothers couldn't tell the difference when both were in makeup.

Keeley definitley reminds me of Keira, though it's hard to tie down exactly which of their features are similar.
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I was just watching her on Jonathan Ross and said to my mother how she could pass for Keira's older sister (about 10 yrs older to be precise).

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There's a prominent jawline that seems to be floating around the british gene pool. I think that's what you're seeing. KK has it, Keeley, Jaime Murray as well.

I'm a woman, straight, and I fancy both Keira and Keeley, so them playing sisters in a film would suit me fine. I do think that Keeley is a better actress, though. But who out of both of them is the more beautiful I can't decide. They both have striking features and interesting faces.
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I agree with the OP. Really, they have the same kinda noses and voices and they look veery similar. Tipping the Velvet introduced Keely to me and now I can't think of anything else.

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I bet that's why she was cast partly, in Pirates opposite Johnny Depp