Watch: Billie Eilish performs 'When the Party's Over,' gets Justin Bieber scare on 'Ellen'
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Billie Eilish stopped by “The Ellen DeGeneres Show” on April 1 to promote her debut studio album When We Fall Asleep, Where Do We Go?  

The Los Angeles native teen delivered a haunting performance of “When the Party’s Over” during her appearance. The track is one of two lead singles from her critically-acclaimed album and she kicked off the performance while sitting in a chair with her feet submerged in a pool of water.

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Eilish was accompanied on piano and eventually got up and moved through the water while singing the chorus “Quiet when I'm coming home and I'm on my own/I could lie, say I like it like that, like it like that/I could lie, say I like it like that, like it like that …”

Eilish displays a maturity in her sultry vocals that belies her young age. A quick pan of the audience showed fans singing along with her.

During her candid interview with Emmy-winning talk show host Ellen DeGeneres, Eilish talked about meeting a lot of famous people in her budding career, including Dave Grohl, who was in the audience at “Ellen” and sharing a FaceTime session with Stella McCartney and her dad, Paul McCartney.

 She also opened up about living with Tourette Syndrome and deciding not to talk about it previously because she didn’t want the diagnosis to define who she is. She credited her fans for speaking up about it now saying, “I think I've also learned that a lot of my fans have it, which made me feel kind of more at home with saying it.”

And of course, being on the show on April Fool’s Day, DeGeneres couldn’t resist pulling a prank on the unsuspecting teen. After talking about her love for Justin Bieber a show staff member wearing a Bieber wig jumped up and startled her.

Watch the hilarious prank below and her “When the Party’s Over” performance above.

Billie Eilish is touring to support her new album on the When We Fall Asleep Tour with Denzel Curry. The tour includes a stop at Red Rocks Amphitheatre in Denver, Colorado on June 5. Grab tickets to see the show from AXS.