Celeb Spotter 104: 'Once Upon a Time in Hollywood' premiere and more celebrity sightings

Everyone's excited for "Once Upon a Time in Hollywood," it seems.

The premiere for Quentin Tarantino's latest film was the talk of the town this week, with its stars -- Brad Pitt, Leonardo DiCaprio and Margot Robbie, among others -- stepping out for its Los Angeles premiere and a slew of other press outings this week, including a surprise-filled "Jimmy Kimmel Live!" appearance.

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

Britney Spears was also at the premiere, where she made her red carpet debut with boyfriend Sam Asghari.

Also out and about this week was Billie Eilish, who performed at a star-studded Chanel party in the Hamptons; Ciara, who took part in the Propel Co:Labs Fitness Festival in Santa Monica; and Prince Harry, who shared an adorable dance with Jane Goodall at an event at Windsor Castle.

See all of our favorite celebrity sightings of the week below:

33 PHOTOS
Celeb Spotter 104: 'Once Upon a Time in Hollywood' premiere and more celebrity sightings
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Celeb Spotter 104: 'Once Upon a Time in Hollywood' premiere and more celebrity sightings

Rob Lowe and his son John Owen Lowe posed together at Netflix's "The Politician" L.A. Tastemaker at San Vicente Bungalows on Tuesday.

(Photo by Anna Webber/Getty Images for Netflix)

Britney Spears and her boyfriend, Sam Asghari, made their red carpet debut on Monday at the Los Angeles premiere of "Once Upon a Time in Hollywood."

(Photo by Axelle/Bauer-Griffin/FilmMagic)

Prince Harry and Dr. Jane Goodall shared an adorable dance at Goodall's Roots & Shoots Global Leadership Meeting at Windsor Castle on Tuesday.

(Photo by Kirsty Wigglesworth - WPA Pool/Getty Images)

Bella Hadid stepped out in the Color-Blocked Black, White and Red Shirt from the Diesel Red Tag x GR-UNIFORMA collection in New York City on Thursday. (Credit: Getty Images/Michael Stewart)

Margot Robbie surprised her "Once Upon a Time in Hollywood" director Quentin Tarantino during his appearance on "Jimmy Kimmel Live!" this week.

(Randy Holmes via Getty Images) QUENTIN TARANTINO, MARGOT ROBBIE, JIMMY KIMMEL

Billie Eilish attended Chanel's dinner in celebration of the J12 Yacht Club at Sunset Beach over the weekend. (Credit: BFA)
Spotify hosted Chance The Rapper's "The Big Day" album release party for over 500 of his biggest fans at The Garfield Park Conservatory on Thursday night. (Credit: Getty Images for Spotify)

Idris Elba and Helen Mirren cozied up at a special screening of
"Fast & Furious: Hobbs & Shaw" in London on Tuesday.

(Photo by Joel C Ryan/Invision/AP)

Laura Prepon attended the premiere for the final season of her Netflix hit, "Orange Is The New Black," where she carried a Mlouye bag, at Alice Tully Hall in New York City on Thursday.

(Photo by Efren Landaos/SOPA Images/LightRocket via Getty Images)

Ciara co-led a workout at the Propel Co:Labs Fitness Festival at Barker Hanger in Santa Monica with her personal trainer Decker Davis.

(Credit: Michael Simon/Startraksphoto.com)

Christina Anstead showed off her growing baby bump alongside husband Ant Anstead at Discovery's "Serengeti" premiere at the Wallis Annenberg Center for the Performing Arts in Beverly Hills on Tuesday.

(Photo by Michael Kovac/Getty Images for Discovery Channel )

Mario Lopez and his son, Nico, posed together at the Bones Love Milk Shredquarters, an indoor pop-up skatepark experience open during the US Open of Surfing in Huntington Beach, Calif. on Wednesday. (Photo by Matt Sayles/Invision for CMPB/AP Images)
Victoria's Secret models Josephine Skriver and Jasmine Tookes hosted the 5th annual SWEAT Fitness Festival at The Surf Lodge in Montauk over the weekend. (Credit: Madison McGaw / BFA.com)

Catherine Zeta-Jones posed with her husband Michael Douglas and her son Dylan Douglas at the Guildhall, Swansea, ahead of a ceremony where she was honored by her home city with the Honorary Freedom of the City and County of Swansea.

(Photo by Ben Birchall/PA Images via Getty Images)

Ellen Pompeo attends Tamara Mellon x A.L.C. collaboration dinner in Los Angeles.
Ellen Degeneres' DJ Stephen "tWitch" Boss and his family stopped by DQ before bringing Blizzard Treats to the patients at Cohen Children’s Medical Center in Queens in advance of Miracle Treat Day on Thursday, July 25. (Credit: AP/Jason DeCrow)

Gigi Hadid steps out in NYC to launch the Wonderlust Fragrance with Michael Kors.

(Photo by Dimitrios Kambouris/Getty Images for Michael Kors)

Singer King Princess performed at Apple Union Square in Williamsburg, Brooklyn on Thursday night as part of Apple Music's Up Next Live intimate series of live performances. (Credit: Courtesy of Apple Music)

The stars of "Once Upon a Time in Hollywood" -- Brad Pitt, Margot Robbie and Leonardo DiCaprio -- attended the film's premiere in Los Angeles on Monday.

(Photo by Kevin Winter/Getty Images)

"Orange is the New Black" star Jackie Cruz stopped by Kahlua's Zero Likes Given exhibition at 198 Allen Street on the Lower East Side on Wednesday.

(Photo by Noam Galai/Getty Images for Kahlua's Zero Likes Given)

"Bachelorette" couple Jordan Rodgers and JoJo Fletcher struck a pose at the BUILD Series studio in New York City on Tuesday. 

(Photo by Dominik Bindl/Getty Images)

Kelly Rowland partnered with Honey Nut Cheerios to encourage people to join the cereal brand’s Whole Heart Challenge on MyFitnessPal, which runs from now through August.

(Credit: Courtesy of Honey Nut Cheerios)

"Chicago P.D." star LaRoyce Hawkins celebrated National Tequila Day with an intimate dinner at the Tequila Don Julio 'For Those Who Know: Agave & EEEEEATS' event at Taqueria Los Comales in Chicago on Wednesday night. (Credit: Jose Silva)
Camila Morrone, who is dating Leonardo DiCaprio, attended Chanel's dinner in celebration of the J12 Yacht Club at Sunset Beach over the weekend. (Credit: BFA)
Derek Hough lauched the Lay’s Smiles campaign by unveiling the first-ever Smiles Station in Times Square, New York City this week. (Credit: Lay's)

Charli XCX performed during a workout class led by modelFIT at the Propel Co:Labs Fitness Festival for in Santa Monica on Saturday.

(Credit: Michael Simon/Startraksphoto.com)

Taye Diggs attends at 2019 Annual AdoptAClassroom.org Donation Drive at Tweed Court House.

(Photo by Lev Radin/Pacific Press/LightRocket via Getty Images)

"Black-ish" star Marcus Scribner wears KREWE sunglasses during Comic-Con at the "She-Ra and the Princesses of Power" press line.

Photo by Joe Scarnici/FilmMagic,)

John Legend attends the 100 Coconuts and Hamptons Magazine party to celebrate his July cover and LVE Wines. (Photo Credit: courtesy of 100 Coconuts)
Naomi Watts headed out East for the Ulla Johnson Sunset Dinner in Montauk at Duryea’s Lobster Deck. (PH: Courtesy of Ulla Johnson)

Amber Heard attends Giffoni Film Festival 2019 wearing Missoma Jewelry.

(Photo by Giuseppe Maffia/NurPhoto via Getty Images)

Rapper 2 Chainz stepped out in NYC over the weekend for a surprise appearance at Up&Down! (PH: Courtesy of Exposure Communications)
Megan Rapinoe, was spotted with her girlfriend, WNBA player Sue Bird enjoying Moet Hennessy at a nearby table at The LIGHT Vegas enjoying DJ Snoopadelic's performance.
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