She always goes out of her way to pull off a fabulous Halloween costume.

And this year was no different as Heidi Klum looked like a knockout as Jessica Rabbit for her annual costume bash held in New York City.

The 42-year-old Project Runway host got the look down with a fake chest and bottom that gave her an hourglass figure on steroids.

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Ravishing in red: She always goes out of her way to pull off a fabulous Halloween costume. And this year was no different as Heidi Klum looked like a knockout as Jessica Rabbit for her annual costume bash

Incredible: The 42-year-old Project Runway host got the look down with a fake chest and bottom that gave her an hourglass figure on steroids

She seemed comfortable in her new skin: The ex-wife of Seal pushed out her chest every chance she got

Too good to be true: The mother of four's curves looked pretty real even though most of her figure was Latex

The model had spent days in a prosthetic lab to create her stunning look.

She dropped hints several times on social media that she was adding to her rail thin figure for her Halloween surprise.

Some people guessed on her Instagram account that she was going as Kim Kardashian or Amber Rose. But they were all wrong.

See the latest Halloween news and celebrity costumes

She's committed: The model had spent days in a prosthetic lab to create her stunning look. She dropped hints several times on social media that she was adding to her rail thin figure for her Halloween surprise

Posing up a storm: Heidi seemed to love her new curves as she sat this way and that way

Where it all started: Heidi dressed as Ms Rabbit from the 1988 film Who Framed Roger Rabbit. The cartoon was voiced by Kathleen Turner

Klum on: Klum's costume was very close to the real thing. She had on a red dress with no straps and a sweetheart neckline. There was also a slit so high it was clear the German was not wearing any panties

Heidi dressed as Ms Rabbit from the 1988 film Who Framed Roger Rabbit. The cartoon was voiced by Kathleen Turner.

Klum's costume was very close to the real thing.

She had on a red dress with no straps and a sweetheart neckline. There was also a slit so high it was clear the German was not wearing any panties.

Teasing the crowd: Heidi slipped into her movie alter-ego seemlessly, teasing and playing up tot he cameras at the event

Come and get her: Dressed in her prosthetic-enhanced costume, the star looked a far-cry from her usual figure

The real Ms Rabbit: The cartoon became a symbol of silver screen sex appeal in the Eighties

Pulling back the curtain: revealing her costume, the star re-enacted the iconic movie Who Framed Roger Rabbit?, starring Bob Hoskins

And the long purple gloves looked as if they were painted on.

Red pumps were a perfect fit.

Her face was completely different. Heidi had very large lips and eyebrows worn very high. Her shadow was purple and her lashes were inches long.

All eyes on Heidi: Fans lined up to get a good look at the bombshell and her new body

A stunning success: The Sports Illustrated cover girl pulled off the difficult look and seemed to know it

It was a long process: The TV host showed the process of how she became Jessica on Instagram

Big fish lips: The Vogue cover model with her mask on, which looked mighty uncomfortable

The eyes have it: Ms Klum's lashes were two inches long it seemed and her eyebrows quite high

The cheek of it: Heidi showcased the care and precision that went into every detail of her costume on Instagram

The grand reveal: Emerging from an elevator into the more spooky surroundings of the event, the model made a grand entrance as she emerged into the lobby

Plenty of front: With her eye-popping costume, the model was certainly the star attraction at her Halloween bash

'Let's get this party started,' the Project Runway star alerted her friends and fans alongside a photo that showed her fresh-faced with hair pulled back into a tight bun.

Heidi sat still as the technicians applied flesh-toned make-up to her forehead and cheeks before lowering a thick, skin-like mask over her entire face.

Just her eyes, nose and mouth were peeking out as the make-up experts worked tirelessly perfecting the 'face.'

Years past: In 2007 the star was a cat for her eighth annual party

Red and purple again, but different: The runway royal was a robot in 2010

Queen of the Nile: She also went as Cleopatra one year

In one shot, Heidi showed off the partial results that were pretty impressive - bald head, slit eyes and crescent brows beneath the black dressing gown she wore.

In another video, Heidi got the lip plumping treatment that transformed her pert mouth into a full pucker.

Now in its 16th year, Heidi's annual Halloween bash will be held at the upscale Italian eatery and nightclub Lavo and sponsored by GSN’s 'Hellevator' and Svedka Vodka.

Another model: Also at the event was Gigi Hadid who dressed as Sandy from 1978 blockbuster Grease

She nailed the look: Hadid looked gorgeous in her tight black outfit with a wig. She also held onto a cigarette and had on sexy red pumps

Old chums? The two catwalkers looked like close pals as they had their arms around each other

Putting on quite the show: The former Victoria's Secret model let plenty of leg show at the club

She's the one that you want: GiGi managed to channel all of Sandy's sass as she arrived at the party looking the spitting image of Olivia Newton-John's character

Making Marge: Blurred Lines beauty beauty Emily Ratajkowski opted for a saucy version of the Simpson's famous matriarch Marge

Her annual shindig typically sets the setting for bizarre costumes, but as she told The New York Post she's giving herself extra time to get ready this year.

'I usually start Halloween weekend late and sleep in, because I know I’m going to be up until 5 or 6 a.m., at least,' Klum said.

'I’ve been working on my Halloween costume for months — it involves a lot of prosthetics and, this year, I’m going to start applying everything around noon.

Dead and darling: Jennifer Lopez and Casper Smart dressed as skeletons for the event held at Lavo

She knows how to show off that body: The 46-year-old Shades Of Blue actress wore a plunging back dress

Dapper in death: Casper still managed to look dapper, despite his scary make-up, in a smart suit

Sexy skeleton: The Jenny From The Block singer oozed glamour and sex appeal as she arrived at the party, pouting and preening in her plunging costume

Ole black magic: Nicole Scherzinger was there too in a black cage dress that showed off her lingerie

A scary siren: Dressed in her bondage bat mash-up, the singer looked every-inch the scary yet saucy siren as she flaunted her enviable body and assets

Friendly fun: NIcole took the time to stop and say hello to a dedicated fan who was dressed as a zebra

Spooky and saucy: In her Vampira-like costume, the former Pussycat Doll flaunted her enviable curves

Also at the event was Gigi Hadid who dressed as Sandy from 1978 blockbuster Grease.

The part in the movie was played by Australian singer Olivia Newton-John.

Hadid looked gorgeous in her tight black outfit with a wig. She also held onto a cigarette and had on sexy red pumps.

Nicole Scherzinger was there too in a black cage dress that showed off her lingerie.

Squeak: Kelly Bensimon showed off her legs in a short Minnie Mouse outfit

Cute as a button: The RHONY star went for a cute and more family friendly look as she mingled with the other guests

More models! Nina Agdal and her boyfriend Reid were spotted heading into Klum's Halloween Party

Malin makes an appearance: Malin Akerman also attended the star-studded bash in a sexy red and black costume

Short shorts: Shanina Shaik made quite the impact in her saucy costume