Millie Bobby Brown Rocks Out to Olivia Rodrigo's 'Good 4 U' in Intense Lip-Sync Video

Millie Bobby Brown
Mike Coppola/Getty Images for Turner

Millie Bobby Brown attends the 26th Annual Screen Actors Guild Awards at The Shrine Auditorium on Jan. 19, 2020 in Los Angeles.

Stranger Things star Millie Bobby Brown is all about Olivia Rodrigo's "Good 4 U."

The actress filmed herself lip-syncing and dancing wildly to Rodrigo's new single in front of a bathroom mirror on Saturday (May 15).

"thank you @Oliviarodrigo you are a legend and i love you. okay bye. thanks again," Brown calmly captioned the clip on Instagram. She also shared a screenshot of a DM with Rodrigo that read: "I love you. period." "OMG I LOVE YOUU," wrote Rodrigo, who eagerly shared Brown's Instagram Story ode to her song.

Saturday is a big day for Billboard's current cover star: Just a day after dropping "Good 4 U," the third song she's released ahead of her debut album, Sour, she's appearing as the musical guest on SNL.

Ahead of Saturday night's show, check out Brown's fun lip-sync performance of "Good 4 U" here.