The Grammy winner is a well-documented Belieber.

BelieberBillie Eilishhas an important message for her younger self.

For the notedJustin Biebersuperfan, the response came easily.

LOS ANGELES, CALIFORNIA - JULY 12: Justin Bieber visits the Wonderbrett dispensary on July 12, 2021 in Los Angeles, California. Hollywood, CA - March 10: Billie Ellish arriving on the red carpet at the 96th Annual Academy Awards in Dolby Theatre at Hollywood & Highland Center in Hollywood, CA, Sunday, March 10, 2024. (Jason Armond / Los Angeles Times via Getty Images)

Billie Eilish; Justin Bieber.Getty (2)

“Any time you want, you’re free to.

And he’ll answer.”

“I can’t take it.

I can’t have to do this show and Justin Bieber’s going to be there.”

In 2019, Eilish recruited her pop idol for aremix of her hit song “Bad Guy.

I definitely feel protective of her,” Bieber said.

If she ever needs me, Im gonna be here for her.

I dont want her to go through anything I went through.

I dont wish that upon anybody.

If she ever needs me, Im just a call away.

Watch Eilish’s “Off the Cuff” segment with Wolff above.