Painfully thin Kate Bosworth displays her bony back at screening of her new horror flick

PUBLISHED: 00:17 EST, 9 May 2013 | UPDATED: 03:56 EST, 9 May 2013

Her thin frame has often been placed under scrutiny.

But Kate Bosworth displayed an especially slender frame at a screening of her new film on Wednesday.

The 30-year-old revealed her bony back in a skimpy top and extremely skinny legs as she attended the preview of her upcoming horror film Black Rock in Hollywood, California on Wednesday night.

Frail-looking: Kate Bosworth appeared painfully thin as she revealed her bony back and skinny legs at a screening of her new horror film Black Rock in Hollywood on Wednesday

The actress wore a silver flouncy skirt which she teamed with a white striped top that sported an open back.

But rather than look alluring, the top only highlighted her bony back, giving her a frail appearance.

She teamed the outfit with silver pointy heels and added a pop of colour with bright coral lipstick.

A tad thin: The 30-year-old wore a skimpy top that highlighted her bony frame as she chatted with attendees at the screenings

Upping the glamour: The actress wore her blonde hair in a sleek updo and added a pop of colour with a bright coral lipstick

She's back: The pretty starlet seemed to revel in showing off her bony features to the crowd

Doing her bit: The actress made sure that she signed autographs for fans, showing off her tiny legs in the process

Kate was joined by her Black Rock costar Lake Bell, who showed off her athletic figure in a gold floral frock teamed with black satin heels.

The 34-year-old wore her auburn hair in tousled waves over her one shoulder, and highlighted her full lips with a nude lipcolour.

She appeared to be in a rather jovial mood as she posed with her legs spread out as if she were ready to start dancing.

Back together: Kate posed with her Black Rock costars Lake Bell and Katie Aselton at the screening

Skirting attention: She may be the movie's director but Katie also proved she is a fine filly with this outfit

Feeling jolly: Lake was in a jovial mood as she appeared to be dancing on the red carpet

Snow White: Krysten Ritter looked gorgeous with her jet-black hair and porcelain skin as she pouted prior to the screening

Kate and Lake, along with actress as well as the film's director Katie Aselton, star in the horror flick about a holiday that goes horribly wrong.

The trio star as childhood friends who reunite for a girls' getaway on a remote island off the coast of Maine. But when things take a wrong turn, the girls find themselves in a deadly fight for survival.

The film releases in US cinemas on May 17.

Springtime fashion: Beth Behrs and Melanie Lynskey shone in bright frocks at the event

Covering up: Kelly Oxford hid her curves under a loose white skirt and black blouse

Quirky: Comedian Ed helms attended the event wearing a jaunty straw fedora and green corduroy jacket

Kate was spotted on Wednesday jetting into Los Angeles International Airport with her fiance Michael Polish.

She looked chic in straight leg jeans and a simple black sweater, shielding her eyes with aviator sunglasses.

Michael, meanwhile, looked trendy in motorcycle boots and a leather jacket worn over a red flannel shirt.

Holding on tight: Kate looked chic as she arrived at LAX on Tuesday clasping her fiance Michael Polish's hand

Always stylish: Kate looked slender in baggy blue jeans and a white sweater as she made her way out of the airport with her fiance

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She is no more painfully thin that Miranda Kerr is, yet you praise her "perfect" body, her legs are as thin and as shapeless, yet Miranda Kerr's are "perfect" difference is Kate is only petite at 5 ft 4 ins. I am no fan of Bosworth at all with her cheek implants and lip fillers, but the hypocrisy is disgusting!!

- robertthebruised , York, 09/5/2013 21:39

Click to rate Rating 33

She's always been skinny, nothing new and the majority of the women in the other pictures don't look that healthy either but they're 'curvy', ok then.

- Clare13 , Scotland, United Kingdom, 09/5/2013 21:29

Click to rate Rating 17

Bony, shapeless legs...

- BladeRazor , Chicago, 09/5/2013 21:06

Click to rate Rating 8

A woman's weight can fluctuate due to stress, nerves, work, you name it. Some pile on a few pounds and others lose a few. I don't think she looks bony but so what if she did? It's such a bore. - Miller , Huffington, United Kingdom, 09/5/2013 17:45 - I just can't believe that people don't think she is too thin. She looks ill. And yes some people are naturally smaller than others, I get that, but this is right. If you think it is then you have a very unhealthy view.

- Tippy Toes , Hove, 09/5/2013 21:04

Click to rate Rating 13

Yes she's skinny, but not any thinner than any of those Victoria Secret models who you love to praise for their "curvey" figures...

- person , London, United Kingdom, 09/5/2013 20:06

Click to rate Rating 42

Kate is Beautiful, talented and very petite, but she's not out of proportion. She no skinnier then Victioria Beckham! Yet DM never headline her with "Bony back" and "skinny legs" why? She's always referred to as " svelte" "slim" etc... In fact, Kate's arms, legs and chest look much better then VB's... But I guess, Kate doesn't have Victoria's juggernaut PR machine working overdrive ...

- Lizw8 , London, 09/5/2013 20:04

Click to rate Rating 21

What a horrendouly horrid woman. First of all, who is this ugly hanger? Secondly, who the hell is paying her to do what? She's absolutely vile, and the people who support this type of disgust are equally vile.

- sara_antoinette , orange, United States, 09/5/2013 19:49

Click to rate Rating 24

Apparently the DM prefers women with a pad of back fat

- Sarah the nurse , Iowa USA, 09/5/2013 19:29

Click to rate Rating 9

More than half of these fillies are only good for the glue factory now. But Beth Behrs is a true thoroughbred with a sturdy pair of pins that wouldn't buckle at the first hurdle. My money's on her.

- Finkelstein , TwelveInch Turkey Sub Sandwich, South Georgia And The South Sandwich Islands, 09/5/2013 19:24

Click to rate Rating 12

Why is there an implication that because Aselton works behind the camera, it's somehow surprising that she's attractive? And calling her a 'fine filly' is a little offensive.

- Kate , London, 09/5/2013 19:02

Click to rate Rating 34

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