“Wait, am I old now?”—Fans laugh as Amanda Seyfried reacts to Sabrina Carpenter being fan-cast as her daughter in ‘Mamma Mia 3’

Amanda Seyfried had the best reaction to fans suggesting that Sabrina Carpenter should play her daughter in Mamma Mia 3. The actress, who played Sophie in the first two films, appeared on The Tonight Show starring Jimmy Fallon and was caught off guard by the idea. Her response? A mix of flattery, humor, and a slight existential crisis.

“Big fan. Big fan. Big fan,” Seyfried repeated with a smile when Fallon mentioned the fan casting. While she was clearly enthusiastic about Carpenter, her initial reaction, “Wait, am I old now?” instantly became the internet’s new favorite inside joke.

Amanda Seyfried’s Viral Reaction to ‘Mamma Mia 3’ Fan Casting

It all started when fans on social media began speculating about who could join the Mamma Mia universe if a third movie happened. Naturally, someone suggested that Sabrina Carpenter, with her golden locks and retro charm, would be the perfect choice to play Sophie’s daughter.

When Fallon brought it up, Seyfried’s three-time declaration of being a “big fan” of Carpenter had people cracking up. It wasn’t just what she said, it was how she said it. The delivery, the slight pause, the realization creeping in. Was she really at an age where she could believably have an adult daughter on screen?

The internet wasted no time making the moment go viral. Clips of her reaction spread across Twitter, Instagram, and TikTok, with fans either laughing at her mild existential crisis or, in some cases, spiraling into their own.

The reactions were instant and priceless. One fan summed it up perfectly:

“Playing as her daughter? Is she that old now? That means I’m getting old too 😭😂”

And just like that, an entire generation had a collective moment of realization.

Others pointed out the irony of Seyfried repeating “big fan” three times.

“She said it three times… and this is the third Mamma Mia. Coincidence? I think not.”

Some fans even went full detective mode, suggesting that maybe Seyfried was already in on the idea and just playing it cool. (Unlikely, but we respect the commitment.)

Then there was the debate over whether Carpenter really could fit into the Mamma Mia world. One fan noted,

“Sabrina has a very vintage look, tbh.”

Another added, “So she could be in the next Mamma Mia? Wow.”

It’s safe to say the internet was on board with the casting whether or not the filmmakers had even considered it yet.

Of course, some simply used the moment as an excuse to freak out about time passing. The thought of Amanda Seyfried playing a mom to a full-grown Sabrina Carpenter was, for some, just too much.

The possibility of a third Mamma Mia has been teased before, but nothing official has been confirmed. Still, if it ever happens, fans have made it clear that they wouldn’t mind seeing Carpenter join the cast. And if Seyfried’s reaction is anything to go by, she might be just as excited about the idea after recovering from the realization that she’s now old enough to have a 25-year-old daughter in a movie.

For now, we’ll just have to wait and see. But one thing’s for sure: whether or not Mamma Mia 3 happens, the internet will never forget the day Amanda Seyfried had her “Wait, am I old now?” moment. And honestly? We all felt that.