Billie Eilish Performs Stripped-Down Cover of Childish Gambino's 'Telegraph Ave': Watch

Billie Eilish
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Billie Eilish performs at 'Alt Nation' at the SiriusXM Studios on Nov. 5, 2018 in New York City.

Billie Eilish stopped by SiriusXM studios to perform a stripped-back session of songs on Tuesday.

Eilish's brother Finneas O'Connell, who helps co-write and produce her music, accompanied her on the keyboard and acoustic guitar during the intimate session. The 16-year-old performed moving renditions of her hit singles "You Should See Me in a Crown" and "When the Party's Over," harmonizing her soulful voice and angelic hums along with her brother.

Eilish also gave her take on Childish Gambino's "Telegraph Ave," slowing down the rap song with a ukulele and her instantly recognizable hushed vocals.

Eilish's performance, which aired on SiriusXM's Alt National channel, comes on the heels of the Tuesday release of her gentle new track "Come Out and Play," as part of Apple's "Share Your Gifts" holiday ad campaign.

Watch clips of Eilish's Sirius XM performance below.