Billie Eilish & Brother Finneas Celebrate Their Wins at Universal's After-Grammys Party!

Billie Eilish and brother Finneas O’Connell pose for photos inside Universal Music Group’s After-Grammys Party on Sunday night (January 26) at Rolling Green Nursery in Los Angeles.

The 18-year-old singer looked super cool in a head-to-toe Gucci outfit as she and her brother celebrated their big night after the awards show.

PHOTOS: Check out the latest pics of Billie Eilish

During the Grammys, Billie became youngest person and the first female artist to win all four top awards – Best New Artist, Album of the Year, Song of the Year, and Record of the Year – in the same year.

READ MORE: Billie Eilish Doesn’t Think She Deserved to Win Album of the Year at Grammys 2020!

10+ pictures inside of Billie Eilish at the Grammys after-party…