Oscars 2020: Stars dress casually at Academy Awards rehearsals

The biggest night in takes place Sunday as the stars arrive for the Academy Awards.

But such an event requires months of preparation, including rehearsal for the A-list presenters.

Salma Hayek, and Timothée Chalamet were among those running lines onstage at Dolby Theatre in on Saturday.

Pre-show look: Salma Hayek went makeup free as she sported a black Balenciaga shirt with matching printed pajama pants Saturday at rehearsal for the Academy Awards

Pre-show look: Salma Hayek went makeup free as she sported a black shirt with matching printed pajama pants Saturday at rehearsal for the Academy Awards

The venue was staffed with production crew, adjusting lighting and putting finishing touches on the set, dressed with 40,000 Swarovski crystals.

Seats were marked with cardboard placards, featuring the names of A-list actors like Leonardo DiCaprio, Brad Pitt and Charlize Theron. 

Celebs who were there opted for their casual daytime looks before going through hair, makeup and designer styling for the real thing.

They paired up with their presenting partners, as they rehearsed their bits and figured out their blocking. 

Paired off: Natalie Portman wore a black turtleneck with faded jeans, as she took the stage with co-presenter Timothée Chalamet, who rocked an oversized teal sweater

Paired off: wore a black turtleneck with faded jeans, as she took the stage with co-presenter Timothée Chalamet, who rocked an oversized teal sweater

Gal pals: Maya Rudolph reunited with her longtime pal and Bridesmaids co-star Kristen Wiig to present together

Gal pals: Maya Rudolph reunited with her longtime pal and Bridesmaids co-star Kristen Wiig to present together

Floral chic: She sported a casual chic blue floral button-down blouse, tucked into a pair of high-waited jeans

Floral chic: She sported a casual chic blue floral button-down blouse, tucked into a pair of high-waited jeans

Sweater weather: Wiig kept warm in an oversized black sweater with the sleeves rolled up, paired with black jeans

Sweater weather: Wiig kept warm in an oversized black sweater with the sleeves rolled up, paired with black jeans

Hayek went makeup free as she sported a black shirt with matching printed pajama pants from the designer brand. 

Portman wore a black turtleneck with faded jeans, as she took the stage with co-presenter Chalamet, who rocked an oversized teal sweater.

His movie Little Women is up for several awards at Sunday's show, including Best Motion Picture. 

Maya Rudolph reunited with her longtime pal and Bridesmaids co-star Kristen Wiig to present together.

Satin stunner: Jane Fonda took the stage in a fuchsia satin blouse, tucked into a pair of dark denim flared jeans

Satin stunner: Jane Fonda took the stage in a fuchsia satin blouse, tucked into a pair of dark denim flared jeans

She sported a casual chic blue floral button-down blouse, tucked into a pair of high-waited jeans. 

Wiig kept warm in an oversized black sweater with the sleeves rolled up, paired with black jeans. 

According to People, Chalamet geeked out at the sight of the funny ladies: 'Oh my gosh, this is an epic thing to see!'

As he sat front row, Rudolph quipped back at her biggest fan: 'Save that for after you see it!' 

He and Portman were up after the duo of funny ladies, as he said: 'They’re right before us?! Oh God!'

Dynamic duo: Sandra Oh donned a chic look in a black and white houndstooth jacket as co-presenter Ray Romano sported a white Titleist baseball cap

Dynamic duo: Sandra Oh donned a chic look in a black and white houndstooth jacket as co-presenter Ray Romano sported a white Titleist baseball cap

Hell on heels: Mindy Kaling wore a buffalo plaid topcoat with a blue sweatsuit and white strappy platform stilettos

Hell on heels: Mindy Kaling wore a buffalo plaid topcoat with a blue sweatsuit and white strappy platform stilettos

Cool dad: Tom Hanks served cool dad vibes in a black denim jacket as he took the stage with Academy President David Rubin

Cool dad: Tom Hanks served cool dad vibes in a black denim jacket as he took the stage with Academy President David Rubin

Polka dots: Spike Lee sported a black hat with white polka dots and a black jacket as he opened an envelope onstage, practicing an award announcement

First win: The acclaimed auteur won his first Academy Award last year, taking home Best Adapted Screenplay for BlacKkKlansman

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Polka dots: Spike Lee sported a black hat with white polka dots and a black jacket as he

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