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Octavia Spencer, Venice Film Festival 2017

Pascal Le Segretain/Getty Images

The 2017 Venice Film Festival is bringing Hollywood's stars to Italy for the premieres of their latest films. The 74th international festival is being held at Sala Grande.

Matt Damon and Kristen Wiig attended the festival Wednesday to promote the movie Downsizing, a science fiction film featuring other notable actors like Christoph Waltz, Jason Sudeikis and Hong Chau. Wiig wore a glitzy, pink Zuhair Murad gown to the red carpet for the screening. 

Amanda Seyfriedand Ethan Hawke were also at the festival for the screening of their film First Reformed, which is being presented in competition. For the red carpet, Seyfried wore a black dress with a colorful bodice and semi-sheer details and sported a wavy ponytail. Hawke opted for a navy suit. 

Rebecca Hall, a jury member, also attended the screening wearing a flowing gown and carrying a gold clutch. 

But these weren't the only stars to make an appearance.

Octavia Spencer attended the festival, as well, to promote the film The Shape of Water. The film was directed by Pan's Labyrinth's Guillermo del Toro and is set to debut this fall. Spencer wore a blue and semi-sheer dress.

For pictures of the celebrity sightings, check out the gallery:

Darren Aronofsky, Michelle Pfeiffer, Jennifer Lawrence and Javier Bardem, Venice Film Festival 2017

Dominique Charriau/WireImage

Say cheese! The stars of mother! posed with their director. 

Leslie Bibb & Sam Rockwell, Venice Film Festival 2017

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The To the Bone actress and her famous beau coordinated on the carpet. 

Jim Carrey, Venice Film Festival 2017

Dominique Charriau/WireImage

The famous funny man posed for photographers at an event for his project, Jim & Andy: The Great Beyond - The Story Of Jim Carrey & Andy Kaufman With A Very Special, Contractually Obligated Mention Of Tony Clifton.

Stella Maxwell, Venice Film Festival 2017

Dominique Charriau/WireImage

The Victoria's Secret model was pretty in pink on the red carpet. 

David E. Kelley & Michelle Pfeiffer, Venice Film Festival 2017

Dominique Charriau/WireImage

The famous husband and wife were all smiles as they arrived to a mother! screening. 

Jennifer Lawrence, Venice Film Festival 2017

Dominique Charriau/WireImage

The mother! star stunned in a sheer full-skirted gown by Dior. 

Venice Film Festival, George Clooney, Amal Clooney

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The two walked their first red carpet together since welcoming twins Alexander and Ella in June.

George Clooney, Amal Clooney, Venice Film Festival 2017

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The married pair returned to their wedding destination city where George was promoting his new film Suburbicon.

Julianne Moore, George Clooney, Venice Film Festival 2017

Mark Milan/GC Images

The two arrive to promote his new film Suburbicon.

Julianne Moore, Venice Film Festival 2017

Stefania D'Alessandro/WireImage

The actress' ensemble complete with Chopard jewelry looked red hot on the red carpet.

Rowan Blanchard, Venice Film Festival 2017

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The actress attended a photo call for Miu Miu Women's Tales.

Jennifer Carpenter, Venice Film Festival 2017

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The Dexter alum, who stars in the film Brawl in Cell Block 99, kept it casual while outside in Venice. 

Zosia Mamet, Venice Film Festival 2017

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The Girls star gave off a cool vibe while attending the photocall for the Miu Miu Women's Tales short film series. Naturally, she wore Miu Miu. 

Rebecca Hall, Venice Film Festival 2017

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The British actress looked gorgeous in her Prada gown at the First Reformed screening.

Amanda Seyfried

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The actress (in Alexander McQueen and Chopard Jewelry) pose at the premiere of First Reformed.

Kristen Wiig, Venice Film Festival 2017

Stefania D'Alessandro/WireImage

The actress (Zuhair Murad) looked pretty in pink while attending the festival for Downsizing

Octavia Spencer, Venice Film Festival 2017

Pascal Le Segretain/Getty Images

The Oscar winner (in Tadashi Shoji) smiled from ear to ear while promoting The Shape of Water

Matt Damon, Venice Film Festival 2017

Mark Milan/GC Images

The Downsizing star gave a wave.

Ethan Hawke, Venice Film Festival 2017

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The First Reformed actor looked dapper in his suit jacket.

Izabel Goulart, Venice Film Festival 2017

Mark Milan/GC Images

The mega model (in Alberta Ferretti) blew a kiss.

Other movies in competition this year include Mother!, Suburbicon and Human Flow.

For more Venice Film Festival updates, tune in to E! News tonight at 7 and 11, only on E!