Jimmy Kimmel dumbfounded as movie stars crash his monologue: 'Can I help you?'

"Can I help you?"

That was the question that late-night host Jimmy Kimmel asked Margot Robbie as she glided through his "Jimmy Kimmel Live!" set to go to the premiere of her new film, "Once Upon a Time in Hollywood."

The actress was the first of three of the film's stars to walk through Kimmel's monologue filming during Monday night's episode, resulting in a hilarious segment that has already gone viral online.

SEE ALSO: All of the glam red carpet looks from the 'Once Upon a Time in Hollywood' premiere

Next was co-star Brad Pitt, who told Kimmel he was "just cuttin' through" on his way to the premiere across the street.

"I get it, but, I just want to say, this is not just some kind of an alleyway," Kimmel told Pitt. 

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HOLLYWOOD, CALIFORNIA - JULY 22: Leonardo DiCaprio arrives at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Brad Pitt arrives at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Margot Robbie attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Margot Robbie attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: (L-R) Brad Pitt, Margot Robbie and Leonardo DiCaprio arrive at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Pierce Brosnan and Dylan Brosnan attends Sony Pictures' "Once Upon A Time...In Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Matt Winkelmeyer/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Pierce Brosnan and Dylan Brosnan attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Dylan Brosnan attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)

HOLLYWOOD, CALIFORNIA - JULY 22: Elsa Pataky and Chris Hemsworth attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California.

Elsa wore a Ba&sh dress, currently on sale for 50% off!

(Photo by Axelle/Bauer-Griffin/FilmMagic)

HOLLYWOOD, CALIFORNIA - JULY 22: Julia Butter (L) and Leonardo DiCaprio arrive at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Quentin Tarantino arrives at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Snoop Dogg attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Britney Spears and Sam Asghari attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Robert Carradine arrives at the Sony Pictures' "Once Upon A Time...In Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CALIFORNIA - JULY 22: Timothy Olyphant attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Joe Manganiello and Sofia Vergara attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Sofia Vergara attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Luke Hemsworth and Samantha Hemsworth attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: (L-R) Scout Larue Willis, Tallulah Belle Willis and Rumer Willis arrive at the premiere of Sony Pictures' "One Upon A Time...In Hollywood" at the Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Vanessa Hudgens and Austin Butler attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: John Stamos and Caitlin McHugh attend Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Adriana Lima attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Andy Serkis attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Maya Hawke attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Rebecca Gayheart attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Topher Grace attends The Los Angeles Premiere Of "Once Upon A Time In Hollywood" at TCL Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: April Love Geary and Robin Thicke attend The Los Angeles Premiere Of "Once Upon A Time In Hollywood" at TCL Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Rebecca Rittenhouse attends The Los Angeles Premiere Of "Once Upon A Time In Hollywood" at TCL Chinese Theatre on July 22, 2019 in Hollywood, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
HOLLYWOOD, CALIFORNIA - JULY 22: Margaret Qualley attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CALIFORNIA - JULY 22: Kevin Smith and Jennifer Schwalbach Smith arrives at the Sony Pictures' "Once Upon A Time...In Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CALIFORNIA - JULY 22: Travis Scott attends Sony Pictures' "Once Upon a Time ... in Hollywood" Los Angeles Premiere on July 22, 2019 in Hollywood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
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Last it was Leonardo DiCaprio, who was making his first ever appearance on Kimmel's show. When Kimmel confronted the Oscar winner about what he was doing, he said that he was there to deliver an epic surprise to the adoring studio audience, who went crazy for his reveal.

Watch the full moment in the clip at the top of the page.

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