Karlie Kloss is a total knockout at the 2017 Oscars: See her unexpected look!

Karlie Kloss was a total vision at the 2017 Oscars.

The multi-talented model made an unexpected appearance at the 89th Annual Academy Awards at the Dolby Theater on Sunday night, and she looked like a complete knockout in an asymmetrical Stella McCartney white gown.

SEE ALSO: Oscars 2017: Complete winners list

Kloss, who's currently dating Joshua Kushner (brother of Jared), rocked a floor-length all-white dress with a chic, built-in cape. The dress featured an unexpected twist, though, as the cape only covered one of her shoulders! The other half of her look was totally sleeveless.

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Karlie Kloss at the 2017 Oscars
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Karlie Kloss at the 2017 Oscars
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Kevin Mazur/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Kevin Mazur/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 26: Model Karlie Kloss attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
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The star paired her glam look with an oversized, floral diamond choker and diamond earrings. Her hair and makeup gave off major Old Hollywood vibes -- between her wavy blonde lob and her piercing red lip, we had to double check what year it was!

Her dress was also adorned with a blue ribbon in honor of the ACLU.

Kloss is always a winner on the red carpet, and the 2017 Oscars were no different.

See all of the red carpet arrivals below:

89 PHOTOS
Oscars 2017: Red carpet arrivals
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Oscars 2017: Red carpet arrivals
Jennifer Aniston put her best foot forward in an extremely sexy black dress that featured a thigh-high sliy an nd a plunging neckline. Lookin' good J! REUTERS/Danny Moloshok
Metallic maven! Red-carpet veteran Jessica Biel strikes gold in this unique number.

Nicole Kidman was the epitome of perfection in a sparkling nude Armani gown she paired with a dramatic red lip.

(Photo by Frazer Harrison/Getty Images)

'La La Land' star Emma Stone stunned, yet again, in a fringed gold Givenchy ensemble. She looked sophisticated with her dramatic red lip and Old Hollywood-inspired curls.

(Photo by Frazer Harrison/Getty Images)

Lady in red! Ginnifer Goodwin matched the red carpet in a long-sleeved, sheer ensemble that she matched with a clutch of the same color.

(Photo by Jeff Kravitz/FilmMagic)

'Fifty Shades Darker' star Dakota Johnson opted for a more conservative look in a yellow-hued gown that covered most of her body.  

(Photo by Steve Granitz/WireImage)

Ruth Negga, nominee for Best Actress, wears vibrant red Valentino.

Wow! Charlize Theron stunned in metallic black Dior ensemble with a plunging neckline.

(Photo by Frazer Harrison/Getty Images)

The queen is back! Halle Berry made her triumphant Oscars return in a one-shoulder black-and-gold gown.

(Photo by Steve Granitz/WireImage)

Michelle Williams dazzled in a two-toned halter gown with a plunging neckline.

(Photo by Jeff Kravitz/FilmMagic)

Matt Damon looked totally dapper in his sleek tux, but it was his wife Luciana Barroso who stole the show in a sophisticated grey ensemble with a plunging neckline.

(Photo credit should read VALERIE MACON/AFP/Getty Images)

Meryl Streep basically skipped the red carpet, but she made sure to show off her dress inside and was a stunner in a midnight blue off-the-shoulder dress. 

(REUTERS/Lucy Nicholson)

Scarlett Johansson turned out to the Oscars in a totally different number, a pastel pink silky, flowy dress with a thick belt. (Photo by Jeff Kravitz/FilmMagic)
THE OSCARS(r) - The 89th Oscars(r) broadcasts live on Oscar(r) SUNDAY, FEBRUARY 26, 2017, on the ABC Television Network. (Tyler Golden/ABC via Getty Images) TRUDIE STYLER, STING
"Moana" star Dwayne Johnson and Lauren Hashian were quite the sexy pair. Johnson took a colorful approach in a midnight blue, velvet dress. (Photo by Kevin Mazur/Getty Images)

Brie Larson sported a sophisticated twist to the typical black gown with a dramatic neckline and a ruffled train.

(Photo by Frazer Harrison/Getty Images)

Busy Philipps, who hit the red carpet with BFF and date Michelle Williams, turned heads in a strapless velvet green gown with sheer accents.

(Photo by Kevin Mazur/Getty Images)

Viola Davis was a vision in bright red, wearing an off-the-shoulder look with a classy train.

(Photo by Steve Granitz/WireImage)

Hailee Steinfeld's sheer gown features floral embellishments in pastel shades. 

Chrissy Teigen hits the red carpet in a leggy style that has never failed her. She looks stunning!

(Photo by Frazer Harrison/Getty Images)

Ryan Gosling went the vintage route in a Gucci DIY Made to Order black velvet tuxedo and a black velvet bow tie. The look was both fun and unique. 

(Photo by Jeff Kravitz/FilmMagic)

Salma Hayek's spaghetti-strap bodice plays up her age-defying body -- are we really supposed to believe she's 50?!
Knockouts! Jamie Dornan and Amelia Warner made quite the couple. Amelia looked incredible in a polka dot dress with a cape in a blush color. (Photo by Jeff Kravitz/FilmMagic)

Beautiful! Emma Roberts showed up to the red carpet with fiery new locks. But can we talk about that gown? Absolutely stunning!

(Photo by Kevin Mazur/Getty Images)

Stunning! Alicia Vikander's high-low dark lace gown stole the show. She paired the look with strappy heels and a gorgeous diamond choker. 

(Photo by Kevin Mazur/Getty Images)

OMG! Blanca Blanco's ultra-revealing slit is so front-and-center, we barely even notice the statement shoulders.

Leslie Mann is giving us serious Disney princess vibes (Belle anyone?!) in this bright yellow ball gown.

(Photo by Jeff Kravitz/FilmMagic)

She never disappoints! Olivia Culpo wears a one-of-a-kind Marchesa for Stella Artois gown.
Va-va-voom! Taraji P. Henson is a modern-day Jessica Rabbit in this figure-hugging blue velvet look by Alberto Ferretti.

John Legend's oversized bowtie he matched with his Gucci tux is just quirky enough to stand out.

(Getty)

Scarlett O'Hara, is that you? Nancy O'Dell goes for old-school glamour in this full red ballgown.
Where do we even start?! E! News host Zuri Hall's multi-textured lavender gown is a true work of art.
The definition of "blonde bombshell," Karlie Kloss' streamlined white Stella McCartney look stole the show.

Gorgeous! Octavia Spencer wowed in an off-the-shoulder Marchesa dress with a feathery bottom.

(Photo by Steve Granitz/WireImage)

Aloha! Auli'i Cravalho, voice of Disney's Moana, embraces her Hawaiian roots in a shell-inspired white gown with gold detailing.
Crisp & clean: Lucas Hedges is tailored to perfection in a classic tux.
Hollywood hunk! Luke Bracey ups the game in a black velvet coat.
Fashion Police host Brad Goreski is smart and stylish in a blue velvet smoking jacket.
Glen Powell looks casual on the carpet, but he still cleans up nice in a black tux.
Jason Bateman let Amanda Anka steal the show in her sheer dove gray lace number. Gotta love a sexy halter top!
It's all in the details: TV personality Debbie Matenopoulos' asymmetrical nude gown features a stunning waterfall sleeve.
Sofia Carson is Oscars royalty in a white tulle ballgown with metallic detailing.
Aldis Hodge accents his tux with statement jewelry.
Look at that figure! 'Good Morning America' anchor Robin Roberts glows in gold.
John Savage ditches the black suit/black shoes rule with brown kicks.
A far cry from her 'Star Wars' wardrobe: Felicity Jones' delicate ballerina-inspired tulle dress is understated but stunning.
Isabelle Huppert vamps up an angelic white dress with a bold scarlet lip.
Michael Strahan goes for luxury in a black velvet suit.
Can you believe she's only 14?! Brianna Perez accents her ivory gown with a shimmering silver choker.
Jackie Chan appeared on the carpet with two adorable friends! The star has two real pandas of his own and is an advocate for panda protection.
Jerry O'Connell mixes things up in a silky maroon blazer with dark brown lapels.
'Moonlight' director Barry Jenkins smiles big in a crisp black tux with silk lapels.

Sofia Boutella took a fashion risk with an unexpected feathery twist.

"Hacksaw Ridge" star Teresa Palmer looked gorgeous in a silver number with tons of pleats. (Photo by Frazer Harrison/Getty Images)
Sunny Pawar's kicks -- and awesome attitude! -- are second to none on the red carpet.
Shohreh Aghdashloo is head-to-toe majestic in shimmering black.
Andrew Garfield, nominee for Best Actor, is in good spirits in a slim-fit tux.
Why play by the rules? Riz Ahmed's perfect-fitting blue suit is fun but event-appropriate.
David Oyelowo's clean white jacket is a red-carpet win.
Vince Vaughn was handsome as ever at the Oscars. He's wearing Johnston & Murphy X David Hart Lace Ups. (Photo by Frazer Harrison/Getty Images)
Director Ava DuVernay commands the carpet in a dramatic gray A-line gown.
Jharrel Jerome's black-and-white look is a fashion win for the star's first Oscars ceremony.
HOLLYWOOD, CA - FEBRUARY 26: Actor Jessica Oyelowo attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
Screenwriter Tarell Alvin McCraney is full-on white on white, all the way down to his squeaky-clean loafers.
HOLLYWOOD, CA - FEBRUARY 26: Actor Tracy Pollan attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Kevin Mazur/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Actor Michael J. Fox attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
AMPAS CEO Dawn Hudson looked lovely in white. (Photo by Steve Granitz/WireImage)
Screenwriter Allison Schroeder rocks a gorgeous rose-toned chiffon V-neck gown.
SLAY! No one could rock this incredible multidimensional gown quite like Janelle Monae.
Dev Patel joins the white jacket trend -- and we're loving the scruffy 'do!
She never ages! Laura Dern rocks a sequinned navy gown.
Have mercy! Mahershala Ali is breaking hearts all over the world in this picture-perfect black-on-black ensemble.
HOLLYWOOD, CA - FEBRUARY 26: Actor Andrew Garfield attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
Was math class always this hot? Priyanka Chopra is a geometric goddess in this innovative architectural look.
Lookin' good! Javier Bardem ditched the predictable bowtie for a thin black tie and smart suit from Gucci.
Samuel L. Jackson and LaTanya Richardson Jackson contrast yet complement each other: He wears a deep blue jacket and matching tie, while she opted for romantic peach ruffles.
Always an original! Faye Dunaway's buttoned-up look turned heads on the red carpet.
HOLLYWOOD, CA - FEBRUARY 26: Actor Kate McKinnon attends the 89th Annual Academy Awards at Hollywood & Highland Center on February 26, 2017 in Hollywood, California. (Photo by Kevin Mazur/Getty Images)
Sara Bareilles was absolutely stunning in a red dress with an angled neckline. (Photo by Kevin Mazur/Getty Images)
Jeremy Renner put his best foot forward in a classic tuxedo. (Photo by Kevin Mazur/Getty Images)
Seth Rogen and his wife Lauren Miller looked quite classy in a tux and a red dress. (Photo by Kevin Mazur/Getty Images)
Best Actor nominee Casey Affleck is all cleaned up for his big night -- but he kept his trademark scruffy beard and ponytail! (Did you really expect anything else?)
What can he say except "you're welcome"? 'Moana' star Dwayne Johnson is a real-life demigod in a fun blue velvet jacket and gray pants.
Putting everyone's husbands to shame: Chris Evans conquered the red carpet in this unexpected all-blue ensemble.
Sheldon's looking dapper! Jim Parsons is far from his nerdy "Big Bang Theory" persona on the red carpet. He rocked Johnston & Murphy shoes.
She's giving us butterflies! Kelly Ripa surprised onlookers with a a creature-adorned navy gown.
Go bold or go home! Cynthia Erivo proves she's not afraid of patterns in an A-line frock.

Terrence Howard and Mira Pak arrive at the Oscars. Howard is wearing a Piaget timepiece.

(Photo by George Pimentel/FilmMagic)

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