Amanda Seyfried sees strong similarities between herself and Sydney Sweeney

Speaking to the BBC, Amanda explained: "There's a similarity between us that is uncanny, and it's really fun to work with people [who] are doing life in a similar way, have similar ideals about the job and life."

Amanda plays a housewife who struggles with mental health issues in the movie, and she admits that it was a challenging role to take on.

Discussing her approach to the role, Amanda shared: "You have to play it as realistic as possible because it needs to reflect real life."

Earlier this month, Amanda heaped praise on Sydney, describing her co-star as a "sweetheart".

Amanda praised Sydney for how she's coped with the pressures of fame and success.

The Hollywood star told Vanity Fair: "I don't envy anything she's going through.

"I've spent a lot of time with her; we just hit it off immediately. She's a sweetheart. She's a very generous, kind person at her core. I have to be honest: I did not have a moment like she's having ever.

"[My Mean Girls costar] Lindsay Lohan, we're buddies, and it's really, really, really harmful to people to have that kind of overnight spotlight. Because any press, good or bad, is still a blinding spotlight, and you have to maneuver and negotiate your way around it and outside of it. It's acrobatics that I don't think most people are capable of figuring it out at that age."

Amanda thinks a sudden rise to stardom can actually be "dangerous". However, the actress praised Sydney for how she's coped with the extra attention.

She said: "It's just dangerous, because when you have people s******* on you-or idolising you and following you around-it can't be good for your psyche. It can't make you feel safe in the world.

"But I actually admire the way Syd shows up for work. She always has a smile on her face, even if she's miserable. I hope it doesn't change. I hope she doesn't harden. I just want to keep watching her work. I have really great women in my life, great actors that I've gotten to work with and who have championed me."