‘Masters of the Universe’ Star Camila Mendes and Madelaine Petsch Go Prehistoric as Wilma and Betty for Halloween

Few celebrity friendships are as closely tied to Halloween as the one between Camila Mendes and Madelaine Petsch. Each October, fans start wondering what the former ‘Riverdale’ co-stars will pull off next, and the pair rarely disappoint. This year’s Camila Mendes and Madelaine Petsch Halloween costumes take them back to the Stone Age.

Their choices have long leaned toward nostalgic cartoons, movies and pop culture favorites. That reputation has made each reveal a small cultural event, with fans comparing the new look with past ones and debating where it ranks. The latest entry may be one of their most stylized yet.

Camila Mendes and Madelaine Petsch as Wilma and Betty from ‘THE FLINSTONES’ for Halloween 📸: Amber Asaly https://t.co/uXaj41n6Ft

— Film Updates (@FilmUpdates) October 31, 2026

Mendes and Petsch transformed into Wilma Flintstone and Betty Rubble from ‘The Flintstones’ for a Halloween photo shoot by Amber Asaly. The images are presented with a retro title card reading “Wilma & Betty” in stony, cartoon-style lettering. Against a clean white backdrop, the two pose together, one lounging across the other in a playful, editorial setup.

Petsch plays Wilma in a fitted white one-shoulder mini dress with a jagged zigzag hem, with her red hair styled in a high, curly updo and loose ringlets around her face. She’s also wearing an oversized pearl necklace that makes the look feel theatrical. Mendes plays Betty in a blue mini dress, with a dark bob, a small blue bow in her hair and her own pearls, taking a cleaner, more understated approach to the Stone Age silhouette.

Camila Mendes and Madelaine Petsch as Wilma and Betty for Halloween. 📷 https://t.co/f3Bfc1AHQr

— Cinethology (@thecinethology) October 31, 2026

The costumes lean on a few strong choices rather than layers of props. The cut-out hems evoke prehistoric animal-skin dresses without looking literal, and the oversized pearls add the signature Flintstones accessory. Together, the two outfits read as instantly recognizable, even without a caption.

The photo shoot extends that coordinated look through its composition. Some frames show the pair in tight, laughing close-ups, while others capture them stretched out in full-length poses. The result feels more like a fashion editorial than a typical party snapshot, which fits the duo’s track record of treating their costumes like short photo projects.

Camila Mendes y Madelaine Petsch disfrazadas de Vilma y Betty, de Los Picapiedra, para Halloween. 🧡🎃 📸 Camila Mendes | TikTok https://t.co/SzyezNfuJg

— Fan Club Camila Mendes Argentina (@CamilaMendesAR) October 31, 2026

The two actors, often joined by Lili Reinhart, have built a reputation for coordinating group costumes. In 2020, they appeared as the Powerpuff Girls, and the following year they dressed as characters from ‘Scooby-Doo’, with Mendes as Velma and Petsch as Daphne. In 2022, they were the Sanderson sisters from ‘Hocus Pocus’, with Petsch as Winifred and Mendes as Mary.

In 2023, they became DC’s Gotham City Sirens, with Mendes as Catwoman, Petsch as Poison Ivy and Reinhart as Harley Quinn. Last year’s duo look reportedly cast them as Kim Possible and Shego, and in 2025, Mendes and Petsch coordinated an ‘Alice in Wonderland’ theme at the Vas J Morgan and Michael Braun Halloween party, with Mendes as the Queen of Hearts and Petsch as the Mad Hatter.

Part of the appeal is how closely the costumes track their personalities and appearance. Fans have pointed out that the trio’s group looks often match their hair colors, with a blonde, a brunette and a redhead slotting neatly into iconic trios. That’s especially true here, where Petsch’s red hair is key to Wilma and Mendes’ dark hair suits Betty.

It also helps that their friendship has outlasted the show that brought them together. Looper has noted that with ‘Riverdale’ over and a new season unlikely, Halloween has become one of the few reliable moments when fans see the group reunite. Each costume doubles as a reminder of that bond.

This year’s choice also stands out because it features only two of the former co-stars. Reinhart doesn’t appear in the images shared so far, and the sources I found don’t explain why. Even so, the pairing feels complete, since Wilma and Betty are a duo in their own right.

It’s also a smart showcase for the photographer’s style. Amber Asaly’s clean, bright setup makes the costumes pop, and it keeps the focus on the actors’ chemistry. The result is a set of photos that feel playful without relying on elaborate sets.

Online, the response has been enthusiastic, with the photos drawing hundreds of thousands of views and tens of thousands of likes. Many fans praised the costume for being instantly recognizable and for capturing the characters’ friendship. Others joked that it’s another example of the pair winning Halloween again.

It also continues a trend of celebrity costumes that blend nostalgia with polished photography. In a season filled with big-name looks, a simple concept executed with care can still stand out.

With so many costumes in their history, it’s hard to predict what’s next for the duo. Whatever they choose, fans will likely be ready. For now, the Stone Age look is a fun reminder that Halloween is more fun when it’s shared with a friend.

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