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Billie Eilish Defies Gravity With 'SNL' Performance of 'Bad Guy': Watch

Billie Eilish
Will Heath/NBC

Billie Eilish performs on Saturday Night Live on Sept. 28, 2019.

Billie Eilish made her Saturday Night Live debut while opening the second half of the show's 2019 season with a gravity-defying stunt and a heartfelt, lo-fi performance.

On Saturday night (Sept. 28), host Woody Harrelson gave Eilish a super warm welcome, introducing her as "incomparable" and "incredible" before she took the stage at NBC's Studio 8H. 

Eilish kicked off her evening with a dimension-bending take on (previous chart champion on the Billboard Hot 100) "Bad Guy:" on a stage mocked up as a cartoon version of the SNL set, she "walked" on the walls and the jumped up and down on the ceiling. Eventually, the camera panned out and revealed the optical illusion, and she stepped out of her rotating box and joined the rest of her band as the in-studio audience cheered.

For "I Love You," Eilish opted to end her night on a hypnotizing, acoustic note. She and brother Finneas, in matching Gucci outfits, sang through the somber ballad before a celestial backdrop that brought the night sky into the building. The siblings locked eyes and made each other smile as they harmonized while Finneas strummed an acoustic guitar.   

Watch Eilish perform "Bad Guy" and "I Love You" on SNL below.