Sydney Sweeney feels bad for her 'Echo Valley' costar

Sydney Sweeney has opened up about her acting process.

During her recent appearance at The Tonight Show Starring Jimmy Fallon, Sydney was asked if she goes into her trailer to prepare and then comes out in character.

Sydney replied saying no, but instead she “jumps in and out.”

“It’s kind of psychotic,” she added, to which Jimmy replied, “Like, you're happy and fun, and then …”

“And then they say, 'Action!' and then I'm screaming and crying,” the actress explained.

Sydney hilariously adds, “And then they call, 'Cut!' and I go, 'What's wrong?'”

She then went on to talk about her project Echo Valley, where she stars alongside Julianne Moore, who plays her mom in the project.

Speaking about the scenes where she had to argue, Sydney said, “I felt so bad.”

“I did. 'Cause I am ... I'm vicious. I'm really vicious,” Sydney added.

However, Sydney Sweeney praised working with Julianne Moore.

“She's so kind and fun, and just amazing to work with,” she said.