Hot to trot! Emily Ratajkowski flaunts her stunning figure in skintight white dress at horse racing championships

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Saturday marked the second and final day of the 2016 Breeders' Cup World Championships at Santa Anita Park.

Among the troupe of celebrities who schlepped out to Arcadia, California to see the horse races, Emily Ratajkowski was a scene-stealer.

The 25-year-old swung by in a seemingly airtight white mini-dress that flashed her precipitous legs as strode the lavender carpet.

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Showstopper: On Saturday, Emily Ratajkowski walked the lavender carpet at the second and final day of the 2-16 Breeders' Cup World Championships

Though much of her hair was pulled back and tied behind her head, she'd affected an air of relaxation by letting the rest of it fall free.

She paired her turtlenecked, short-sleeved dress with a pair of nude stilettos. Her toenails as well as her fingernails were painted black.

Elizabeth Banks threw a few modern touches into an ensemble that otherwise wouldn't have been unsuited to the Ascot Racecourse in the 1950s. 

A bit of a schlep: The horse races took place at Santa Anita Park in Arcadia, California

Simple elegance: The 25-year-old paired a tight white mini-dress with a pair of nude stilettos

The 42-year-old's full-sleeved black top seemed simple at the front, but when she turned about, it turned out to be backless.

A black netted veil dangled from a black headpiece designed to look like a tangle of berries and leaves.

Her pleated dress featured images from a garden landscape painting splattered over a white field. Black stilettos rounded out her look.

Retro chic: Elizabeth Banks added a few modern touches to a throwback outfit

Lady bountiful: A black netted veil dangled from a headpiece that was designed to resemble an ample clump of berries and leaves

Reveal: When the 42-year-old turned, her dress turned out to be backless

Taylor Lautner left open a couple of buttons on a white dress shirt that framed his toned physique. A purple belt with pink stitching cinched about silver trousers.

Meanwhile, Wilmer Valderrama cut a dashing figure in a sky blue button-down shirt he left untucked over black trousers.

He pulled a midnight blue blazer over his top, completing his outfit with a pair of wood-soled black dress shoes. 

Bombshell: Taylor Launter dropped by in a white dress shirt that framed his toned physique

A dashing figure: Wilmer Valderrama wore a midnight blue blazer over a sky blue shirt

Susan Sarandon wore a stylish white blouse with a large collar and a neckline that bared a good deal of her cleavage.

Over it, the 70-year-old had popped on a black bomber jacket that was alternately leather and fabric.

Pink-rimmed cat-eye sunglasses complemented her red curls, and she emphasised her still shapely legs in a pair of tight black trousers. 

That winning smile: Susan Sarandon complemented her curly red hair with a pair of orange-rimmed cat-eye sunglasses

Still got it: The 70-year-old's white top bared a good deal of her cleavage

Kevin Dillon had pulled on a blazer checked in varying shades of blue, a powder blue dress shirt underneath. Charcoal slacks spilled onto pine green shoes.

Beside him stood the mystery blonde with whom, as DailyMail.com have reported, he's been publicly spotted multiple times. It's unclear whether or not he's officially divorced Jane Stuart, whom he married in 2006.

His new date, however, wore a translucent blue robe with wave patterns over a white sleeveless miniskirt, having slipped into a pair of nude high heels.

Old-school: Camilla Belle wore a string of pearls over her lacy purple floral dress

Camilla Belle let her wavy brown hair fall over a high-necked pink dress covered in lacy floral patterning. A beige purse matched her beige ankle-strap stilettos and the string of pearls about her neck.

Mark Duplass had rolled up the sleeves of his sky blue dress shirt to the elbow, but he did hold to a bit of formality by tucking it in and adding a navy and gold tie.

Navy trousers did the trick as far as bottoms, and his wife Kate Aselton bared her enviably flat midriff from beneath her tight orange top.

The new lady: Kevin Dillon arrived with the woman he's been seen out with on multiple occasions this year

Happy couple: Mark Duplass beamed alongisde his wife Katie Aselton

Her skirt, which stopped high enough to showcase her toned legs, was splashed with orange and pink designs, and she held a gold-coloured clutch.

Allison Janney's top saw a blue and gold pattern splotched onto an off-white background. It was tucked into hot pink slacks cut off above the ankle.

Beside her, her flame Philip Joncas was the most dapper man on the carpet. A Prussian blue top hat was perched on his head, and a zaffre pocket square popped against his blue and pale gold tartan suit jacket.

Pretty in pink: Allison Janney wore a blue, gold and off-white top over hot pink slacks

Dapper Dan: The Juno actress posed for photos with her boyfriend Philip Joncas

Ever the trio: Boyz II Men turned up to the lavender carpet in identical tuxedos

His tie was the same midnight blue as his trousers, and he'd worn a faded purple dress shirt as well as brown leather shoes.

Boyz II Men, ever the united trio, wore identical tuxedos and had all arrived wearing black sunglasses with lenses of various shape.

After the lavender carpet portion, the celebrities flooded into the actual event and began hobnobbing with one another. 

Happy reunion: The Thelma & Louise star seemed pleased to see the The Hunger Games actress

Back together: The pair both won 2016 Glamour magazine Women Of The Year Awards

Matching smiles: The 40-Year-Old Virgin actress also stood for photos with Ratajkowski

Sarandon seemed particularly pleased when she ran into Banks, her fellow Glamour magazine 2016 Woman Of The Year.

The two women embraced before standing for photos together. Mrs Max Handleman's camel-coloured clutch glinted under the lights. 

At one point, the pair of them posed alongside Ratajkowski and Belle as well, all of them glowing as they smiled.

Old-fashioned glamour: The woman in the veil and the woman in a string of pearls also stood for the cameras beside one another

Quartet: (from right) Ratajkowski, Sarandon, Banks and Belle all hobnobbed together

Beauties in blue: The That '70s Show actor cosied up to Constance Zimmer for a photo

At another, the Seabiscuit star who'd found herself back at the track took a photo as a duo with the Back To The Secret Garden actress.

Valderrama, who later in the event took off his blazer to reveal his shirt had darker blue sleeves and was perfectly fitted over his svelte figure, did some mingling too.

With the jacket still on, he cosied up to Constance Zimmer, who'd popped on a beige top hat with a black ribbon.

Feeling the heat: He'd removed his jacket by the time he stood for the cameras with the Gone Girl actress

Bombshell: His dress shirt was perfectly tailored to frame his svelte figure

Proud display: The Juno actress held up a horse trophy marked 'BREEDERS' CUP CHAMPION'

Her dress, which looked rather like a dressing gown, featured pink flowers on a zaffre field and was paired with pearl grey stilettos. Shades hung from her neckline.

He also did a bit of posing with Ratajkowski, putting a hand at her waist as the photographers snapped away.

For her part, Janney appeared to have come up something of a winner. She beamed as she held up a horse-shaped trophy on a green marble base reading 'BREEDERS' CUP CHAMPION.'

When you got it: The We Are Your Friends star's dress showcased her vertiginous legs

Ready for her close-up: Emily shared a sexy selfie while getting ready earlier that day