Speaking with E! Online at the Dannijo and Tucker Tea event in Los Angeles on Thursday night, Greer -- best known as Kitty on "Arrested Development" -- said that Moretz's portrayal of the telekinetic-powered title teen in "Carrie" is heartbreaking.
"Chloe's performance -- and this is literal -- has brought me to tears on set," she said. "She's made me cry because I find her performance to be incredibly moving. I'm feeling a lot of compassion for her."
Moretz was cast in Kimberly Peirce's remake of "Carrie" back in March. Before being hired, she was in competition with a bunch of young actresses ranging from Dakota Fanning and Lily Collins to lesser-knowns like Bella Heathcote and Haley Bennett.
"Never been so happy in my life!" Moretz tweeted after the news was announced. "Thank you Kim Peirce and thank [you] MGM for the chance of a lifetime I will never forget!"
In addition to Greer and Moretz, "Carrie" stars Julianne Moore and Portia Doubleday. The film is another adaptation of Stephen King's famed horror novel; Brian De Palma directed the first big-screen version with Sissy Spacek in the lead role.
For more about "Carrie," head over to E! Online.