Amanda Seyfried recently discussed her dream casting for a potential Mamma Mia 3, revealing her enthusiasm for seeing Sydney Sweeney join the film, during a conversation at the Governor Awards in Los Angeles. The prospect of Sydney Sweeney Mamma Mia 3 has sparked plenty of speculation, as fans and the cast alike express excitement for another sequel in the beloved musical series.
Amanda Seyfried Endorses Sydney Sweeney for the Next Mamma Mia
During the 16th Annual Governor Awards in Los Angeles, Amanda Seyfried spoke to Entertainment Tonight about who she would like to see in a potential new installment of Mamma Mia. Seyfried, who portrayed Sophie in the previous two films, expressed enthusiasm for Sydney Sweeney joining the cast, highlighting the anticipation among aspiring actors for a spot in the anticipated sequel.
There’s a bunch of girls that really want to be a part of it, and I’m all for it.
– Amanda Seyfried, Actress
Seyfried and Sweeney are already teaming up for The Housemaid, a thriller directed by Paul Feig and based on Freida McFadden’s novel, set for theatrical release on December 19. The film’s trailer made a stir when it debuted in September, presenting a new project for both stars outside the musical genre.
Mamma Mia 3: Hints and Hopes from the Cast
While Universal Pictures has yet to officially announce Mamma Mia 3, Seyfried’s recent comments suggest that optimism is high within the cast.
Maybe I’m just naive, but I’m pretty sure Mamma Mia 3 is a done deal,
– Amanda Seyfried, Actress
Fans continue to speculate on the story’s direction, with Seyfried hinting that she would enjoy exploring her character Sophie’s motherhood journey further in a third installment. She also suggested adding other young stars to the cast, such as Sabrina Carpenter as Sophie’s cousin.
I love portraying a mom, so I would love to see Sophie with her kids,
– Amanda Seyfried, Actress
Maybe she has a cousin she hasn’t seen in a while, and that could be Sabrina Carpenter.
– Amanda Seyfried, Actress
Background: Previous Films and Returning Favorites
Seyfried headlined both the 2008 Mamma Mia! and its 2018 sequel, acting alongside Meryl Streep as Donna, as well as an ensemble including Pierce Brosnan (Sam Carmichael), Colin Firth (Harry Bright), and Stellan Skarsgård (Bill Anderson). The films followed Sophie’s search for her true father among her mother’s past loves, uncovering layers of family history and ABBA-inspired antics. Donna’s story ended in the second film, confirming her character’s death, but emotional connections with the rest of the cast remained central.
I just know the three dads are going to come back, and we still won’t know who the dad is because it doesn’t matter,
– Amanda Seyfried, Actress
Meryl is a ghost, obviously, so she’ll be around. And Julie [Walters] and Christine [Baranski] will be back singing and looking hot, and we’re all going to be somewhere tropical. And ABBA will be playing.
– Amanda Seyfried, Actress
Meryl Streep’s Willingness to Return
Though Streep’s Donna has passed away in the Mamma Mia universe, the acclaimed actress has shown continued interest in exploring creative avenues to return. In September 2023, Streep told Vogue about her ideas for a comeback, suggesting humorously that a twin-sister storyline could revive her character in soap-opera style.
I’ll have to schedule a knee scoping before we film, but if there’s an idea that excites me, I’m totally there. I told [producer Judy Craymer] if she could figure out a way to reincarnate Donna, I’m into that. Or it could be like in one of those soap operas where Donna comes back and reveals it was really her twin sister that died.
– Meryl Streep, Actress
Streep reiterated her openness to the project in May 2024, though she admitted to not knowing the producers’ current plans or script details.
I don’t know how they’re going to do it. They have an idea. I haven’t heard it yet but it’s in [my diary] and I’m going to hear about it pretty soon,
– Meryl Streep, Actress
Of course I want to do it. I think folks love it.
– Meryl Streep, Actress
What a Third Installment Could Mean for the Franchise
The discussion of Sydney Sweeney Mamma Mia 3 reflects both fan excitement and the enduring popularity of the franchise. With Seyfried imagining more motherhood stories for Sophie, and Streep and other original cast members eager for a return, a new film could blend original and fresh faces, continuing the emotional journeys and musical festivities that have captivated audiences worldwide. If formal confirmation arrives, anticipation is likely to build as audiences await how characters like Sophie, Donna, and the three fathers reconnect—and whether newcomers, such as Sweeney or Sabrina Carpenter, join the family in its next chapter.
