Musical fans have a major reason to start celebrating today. Amanda Seyfried just dropped a massive update regarding the long awaited third installment of the Mamma Mia franchise. She is confident the movie is happening and she already has a dream cast list in mind. It looks like she wants some of the biggest young stars in Hollywood to join her on the Greek island.
The Done Deal And Casting Wishes
Amanda Seyfried is currently busy promoting her new thriller film. But that did not stop her from talking about the musical everyone wants to see. She spoke to Entertainment Tonight recently and shared some electrifying news. Seyfried believes that Mamma Mia 3 is officially a “done deal” at this point.
She did not stop there. The actress is looking to recruit fresh talent to the island. She specifically named Sydney Sweeney and Sabrina Carpenter as her top choices. This comes as Seyfried prepares for the release of The Housemaid next month where she stars alongside Sweeney. The chemistry between the two seems to be leading to potential future collaborations.
“Maybe I is just naive, but I am pretty sure Mamma Mia 3 is a done deal. I love portraying a mom. So I would love to see Sophie with her kids,” Seyfried explained during the interview.
She elaborated on how these new stars would fit into the story. “Maybe she has a cousin she hasn’t seen in a while, and that could be Sabrina Carpenter. And then Sydney Sweeney could show up. There are a bunch of girls that really want to be a part of it, and I am all for it.”
This is the first time a lead actor from the franchise has been this specific about casting. It shows that the creative gears are turning behind the scenes. Bringing in names like Sweeney and Carpenter would instantly connect the franchise with a whole new generation of fans.

Amanda Seyfried Mamma Mia 3 Sydney Sweeney Sabrina Carpenter casting news
Returning Favorites And Plot Details
Seyfried also touched on the legacy characters who make the franchise so special. Fans can rest easy knowing the core family is expected to return. The magic of these movies relies heavily on the chemistry between the older generation and the new.
She confirmed her expectations for the original cast members:
- The Three Dads: Pierce Brosnan, Stellan Skarsgård, and Colin Firth are all expected to return to the island.
- The Legacy: Julie Walters and Christine Baranski will be back to provide the comedy and vocals.
- The Matriarch: Meryl Streep will likely return as a ghost since her character Donna passed away in the second film.
Seyfried noted that the mystery of the father does not matter anymore. The focus is on the family dynamic and the music. “We are all going to be somewhere tropical. And ABBA will be playing,” she added.
This formula has worked flawlessly twice before. The first movie was a box office sensation. The sequel, Mamma Mia! Here We Go Again, proved that the audience was still hungry for more. Shifting the focus to Sophie raising her own children opens up plenty of narrative doors. It allows for new songs and new conflicts while keeping the nostalgic elements intact.
Why Sweeney And Carpenter Are Perfect Fits
The addition of Sydney Sweeney and Sabrina Carpenter would be a massive win for Universal Pictures. Both women are currently at the peak of their careers. Their involvement would turn the third movie into a global cultural event.
Sydney Sweeney has actually expressed interest in this before. In an interview from 2023, she mentioned her love for the franchise. “I have always wanted to go to Greece. I love Mamma Mia, something like that would be really fun,” Sweeney told Variety back then. Now that she has worked directly with Seyfried on The Housemaid, that transition seems easier than ever.
Sabrina Carpenter is another logical choice. She has been rumored for other musical projects recently including a potential Alice In Wonderland film. Her vocal range fits the pop style of ABBA perfectly. Seeing her play a cousin to Sophie would provide a great musical foil for the story.
Combining the established stardom of Seyfried with the viral popularity of Sweeney and Carpenter is a smart business move. It bridges the gap between the original fans from 2008 and the younger audience of today.
Studio Status And What Comes Next
It is important to note that the studio has not made an official greenlight announcement yet. Universal Pictures has been quiet about production dates. However, producer Judy Craymer has spent years saying she always envisioned this story as a trilogy.
| Movie | Global Box Office | Release Year |
|---|---|---|
| Mamma Mia! | $694 Million | 2008 |
| Mamma Mia! Here We Go Again | $402 Million | 2018 |
The numbers speak for themselves. Musical comedies are rare financial bets in Hollywood but this franchise is an exception. The delay has likely been about finding the right script and aligning schedules.
With Seyfried openly recruiting co-stars, it puts public pressure on the executives to get moving. The actors are ready. The fans are ready. The music is ready. All that is missing is a filming start date. If Seyfried is right about it being a “done deal,” we might hear an official confirmation sooner rather than later.
There is no doubt that Mamma Mia 3 is one of the most requested sequels in recent memory. Amanda Seyfried has made it clear that she is ready to step back into Sophie’s shoes. The potential addition of powerhouses like Sydney Sweeney and Sabrina Carpenter only sweetens the deal. We just have to wait for the studio to book the tickets to Greece.
Do you think Sydney Sweeney and Sabrina Carpenter are the right choices for the cast? Let us know your thoughts in the comments below or share this story on social media using #MammaMia3 to keep the conversation going!