Emma Stone poses on the red carpet upon arrival for the world premiere of the film 'Maniac' in central London on Sept. 13, 2018.

The news came during a Q&A panel with the Child Mind Institute where Stone opened up about her battle with anxiety.

Hey, Emma! La La Land star Emma Stone accidentally revealed on Oct. 1 that she will appear in an upcoming video for former Beatle Paul McCartney’s next single. The news came during a Q&A panel with the Child Mind Institute where Stone opened up about her battle with anxiety, which she has been struggling with since the age of seven.

Prior to wrapping his session with the actress, moderator Dr. Harold S. Koplewicz asked the actress “what’s next?" And before the star had a chance to answer, Koplewicz quickly added, “besides a video with Paul McCartney.”

“I don’t think you’re supposed to announce that,” Stone said in response to Koplewicz. The actress also said she's working on a sequel to Zombieland.

Capitol Records released Paul McCartney’s 18th solo studio album, Egypt Station, on Sept.7. This is the first time since 2013 that the singer-songwriter had released a record. Greg Kurstin served as producer for the album. As for Stone, audiences will next see her as Abigail Masham, Baroness Masham alongside Olivia Coleman and Rachel Weisz in the period piece The Favourite. The drama opens in theaters Nov. 23.

This article originally appeared on The Hollywood Reporter.