Allison Williams wows in plunging white lace jumpsuit as she leads the stars at Sean Penn Haiti gala

Stars like Allison Williams flocked to The Wiltern in Los Angeles on Saturday for the Sean Penn J/P Haitian Relief Organization gala.

Allison, 30, hinted at her cleavage at the event in a flowing white jumpsuit with puffed out sleeves and a latticed lace motif.

The Girls and Get Out alumna was a showstopper in her kooky getup, which was cinched in at the waist to emphasize her svelte frame.

Wondrous in white: Stars like Allison Williams flocked to The Wiltern in Los Angeles on Saturday for the Sean Penn J/P Haitian Relief Organization gala img-share”>

Wondrous in white: Stars like Allison Williams flocked to The Wiltern in Los Angeles on Saturday for the Sean Penn J/P Haitian Relief Organization gala

She played up her screen siren features with makeup and teased her dark hair into curves, adding a bit of sparkle with some glimmering earrings.

Jamie Foxx was as dashing as ever on the red carpet, teaming a charcoal suit with a white dress shirt and accessorizing with a gleaming watch.

He posted up a storm with Garcelle Beauvais, his old co-star on The Jamie Foxx Show, a sitcom that aired on The WB for five seasons from 1996 until 2001.

Glowing: Allison, 30, hinted at her cleavage at the event in a flowing white jumpsuit with puffed out sleeves and a latticed lace motif

Fabulous: The Girls and Get Out alumna was a showstopper in her kooky getup, which was cinched in at the waist to emphasize her svelte frame

Swanking about: She played up her screen siren features with makeup and teased her dark hair into curves, adding a bit of sparkle with some glimmering earrings

Hello, handsome: Jamie Foxx was as dashing as ever on the red carpet, teaming a charcoal suit with a white dress shirt and accessorizing with a gleaming watch

Nostalgia: He posed up a storm with Garcelle Beauvais, his old co-star on The Jamie Foxx Show, a sitcom that aired on The WB for five seasons from 1996 until 2001 img-share”>

Nostalgia: He posed up a storm with Garcelle Beauvais, his old co-star on The Jamie Foxx Show, a sitcom that aired on The WB for five seasons from 1996 until 2001

Garcelle, who told HuffPost Live she and Jamie had agreed never to get romantically involved with one another, hugged him warmly Saturday.

The 52-year-old actress, who happens to have been born in Haiti, dazzled in a blue striped jumpsuit with a neckline that flashed her decolletage and midriff.

She gathered her hair up into a high bun and modeled hoop earrings, adding a splash of contrast with pink lipstick and a black clutch.

Affectionate: Garcelle, who told HuffPost Live she and Jamie had agreed never to get romantically involved with one another, hugged him warmly Saturday

So stylish: The 52-year-old actress, who happens to have been born in Haiti, dazzled in a blue striped jumpsuit with a neckline that flashed her decolletage and midriff

Aglow: She gathered her hair up into a high bun and modeled hoop earrings, adding a splash of contrast with pink lipstick and a black clutch

Former child star Soleil Moon Frye brought back the flapper era in a blue cocktail dress with a throwback fringe hem and some Art Deco cutouts.

Karolina Kurkova, the Czech former Victoria’s Secret Angel, demonstrated her supermodel credentials in an outfit that showed off her bombshell figure.

The 34-year-old slipped into a black cocktail dress with a slit up the front, accessorizing with hoop earrings and teetering on sky-high black heels.

Her sleeveless outfit featured zipper from its left shoulder to the strip, and it featured a puffed-out short sleeve at the right side.

Still chipper: Former child star Soleil Moon Frye brought back the flapper era in a blue cocktail dress with a throwback fringe hem and some Art Deco cutouts

Radiant: Karolina Kurkova, the Czech former Victoria’s Secret Angel, demonstrated her supermodel credentials in an outfit that showed off her bombshell figure

Megawatt smile: The 34-year-old slipped into a black cocktail dress with a slit up the front, accessorizing with hoop earrings and teetering on sky-high black heels

Smoldering stare: Her sleeveless outfit featured zipper from its left shoulder to the strip, and it featured a puffed-out short sleeve at the right side

Karolina, who married little-known actor Archie Drury in 2009, gathered her signature blonde hair back into a bun for the evening’s gala.

Johnny Galecki, 43, wore skintight torn pants and a purple jacket to the red carpet, where he ostentatiously hugged his girlfriend Alaina Meyer, 21.

His old Roseanne and The Conners co-star Sara Gilbert, 43, rocked a shiny metallic jacket as she posed up Saturday with her wife of four years Linda Perry, 53.

Jimmy Kimmel went for classic glamour in a black suit and silver tie, smiling as he posed alongside his wife Molly McNearney.

Amazing beauty: Karolina, who married little-known actor Archie Drury in 2009, gathered her signature blonde hair back into a bun for the evening’s gala

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Keeping each other close: Johnny Galecki, 43, wore skintight torn pants and a purple jacket to the red carpet, where he ostentatiously hugged his girlfriend Alaina Meyer, 21

Cozying up: His old Roseanne and The Conners co-star Sara Gilbert, 43, rocked a shiny metallic jacket as she posed up Saturday with her wife of four years Linda Perry, 53

Dynamic duo: Jimmy Kimmel went for classic glamour in a black suit and silver tie, smiling as he posed alongside his wife Molly McNearney img-share”>

Dynamic duo: Jimmy Kimmel went for classic glamour in a black suit and silver tie, smiling as he posed alongside his wife Molly McNearney

Sarah Silverman, who incidentally used to date Jimmy, made her way playfully around the red carpet, kicking up one of her heels for the camera.

The 48-year-old comedian and movie star was in a strapless black mini-dress that featured heavy pleating and a curved neckline.

She swept her black hair into a bun and pulled faces through her elegant makeup job, which included some dark scarlet lipstick.

Funny lady: Sarah Silverman, who incidentally used to date Jimmy, made her way playfully around the red carpet, kicking up one of her heels for the camera

Smashing: The 48-year-old comedian and movie star was in a strapless black mini-dress that featured heavy pleating and a curved neckline

Mugging: She swept her black hair into a bun and pulled faces through her elegant makeup job, which included some dark scarlet lipstick img-share”>

Mugging: She swept her black hair into a bun and pulled faces through her elegant makeup job, which included some dark scarlet lipstick

Sarah added a black diamond-stitched anorak to the ensemble and occasionally let it slide off her shoulders, and she rounded off the look with black leather boots.

In one dazzling group shot to remember, Sarah stood for the cameras with Molly, Jimmy, sitcom icon Larry David and a blonde female guest.

Connie Britton slipped into a silver sequined skirt with a bit of frill at its mid-calf hemline, matching her black cowl top to black heels.

She let her blonde curls tumble freely over her shoulders, accessorizing with a couple of rings and posing with a hand placed at her waist.

Staying warm: Sarah added a black diamond-stitched anorak to the ensemble and occasionally let it slide off her shoulders, and she rounded off the look with black leather boots

Quintet: In one dazzling group shot to remember, Sarah stood for the cameras with Molly, Jimmy, sitcom icon Larry David and a blonde female guest

There she is: Connie Britton slipped into a silver sequined skirt with a bit of frill at its mid-calf hemline, matching her black cowl top to black heels

Taking a stance: She let her blonde curls tumble freely over her shoulders, accessorizing with a couple of rings and posing with a hand placed at her waist img-share”>

Taking a stance: She let her blonde curls tumble freely over her shoulders, accessorizing with a couple of rings and posing with a hand placed at her waist

Stylist to the stars Rachel Zoe, who once starred on a reality show about her work, rocked a tuxedo-style pantsuit that draped around her slender figure.

Rebecca Gayhart also went for pantsuit chic, opting for a silver number that shimmered under the lights as she made her way along the carpet.

The 47-year-old model and actress, who filed for divorce from Eric Dane last year, teamed a black lace-fringed top with black shoes and earrings.

Casey Affleck wore jeans and a T-shirt with a blazer to the Sean Penn event, where he was photographed holding hands with his longtime girlfriend Floriana Lima.

Julia was also pictured speaking onstage at the star-studded affair for J/P Human Rights Organization, which per The Hollywood Reporter is now called CORE.

Stylist to the stars: Rachel Zoe, who once starred on a reality show about her work, rocked a tuxedo-style pantsuit that draped around her slender figure

Glamour queen: Rebecca Gayhart also went for pantsuit chic, opting for a silver number that shimmered under the lights as she made her way along the carpet

Glitz: The 47-year-old model and actress, who filed for divorce from Eric Dane last year, teamed a black lace-fringed top with black shoes and earrings

Date night: Casey Affleck wore jeans and a T-shirt with a blazer to the Sean Penn event, where he was photographed holding hands with his longtime girlfriend Floriana Lima

Fun flare: Julia Roberts rocked a double-breasted suit to the gala; she is pictured with the organization’s founder Sean Penn

Who wore it best? Julia compared suits with journalist Anderson Cooper and actor Ben Stiller

Beaming: The Pretty Woman actress showed off her trademark smile during the gala

She was joined in front of the crowd by Jamie, who was seen holding her hand and with whom she co-starred in the 2010 film Valentine’s Day.

Macy Gray gave a showstopping performance at the event, pulling on finger-less gloves as well as a hat and floor-length coat to create an iconic ensemble.

Sean was seen with a look of grave seriousness on his face as he addressed the crowd, and Anderson could be spotted standing right nearby him.

Meanwhile, the Mayor Of San Juan, Puerto Rico, Carmen Yulin Cruz, donned an elegant floral gown and held up a trophy she was presented with.

Limelight: Julia was also pictured speaking onstage at the star-studded affair for J/P Human Rights Organization, which per The Hollywood Reporter is now called CORE

Side by side: She was joined in front of the crowd by Jamie, who was seen holding her hand and with whom she co-starred in the 2010 film Valentine’s Day

Legend: Macy Gray gave a showstopping performance at the event, pulling on finger-less gloves as well as a hat and floor-length coat to create an iconic ensemble

What a duo: Sean was seen with a look of grave seriousness on his face as he addressed the crowd, and Anderson could be spotted standing right nearby him

Glam factor: Meanwhile, the Mayor Of San Juan, Puerto Rico, Carmen Yulin Cruz, donned an elegant floral gown and held up a trophy she was presented with