Amanda Seyfried Explains Why Sydney Sweeney Would be PERFECT for Mamma Mia 3 (Exclusive) // TRAIN BRAIN

Amanda Seyfried Explains Why Sydney Sweeney Would be PERFECT for Mamma Mia 3 (Exclusive)

Amanda Seyfried chats with ET at the premiere of her new film, 'The Housemaid,' which hits theaters Dec. 19. The Oscar-nominee explains what drew her to the film, why her co-star, Sydney Sweeney, would be perfect for a role in 'Mamma Mia 3' and how she plans to celebrate her 40th birthday this week

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