“I will be your #1 fan until the day that I die,” he continued. “There may be actually nothing I really like greater than being your huge brother. Blissful birthday.”
Eilish, whose full title is Billie Eilish Pirate Baird O’Connell, made her debut with When We All Fall Asleep, The place Do We Go? in 2019.
She is the youngest artiste in Grammy historical past and second total to comb all 4 main awards – Finest New Artist, Report of the Yr, Tune of the Yr and Album of the Yr – in the identical 12 months.
On her Instagram account, she posted pictures of her birthday cake adorned with sweet canes and lit candles, and the inside of a bouncy home draped with fairy lights.
In her caption, she merely wrote: “20.”