"Happy 19th birthday Billie! It is the privilege of my life getting to be your brother and making music with you is my greatest joy. I have been so lucky in unlucky time," he wrote.
Keys commented, "Blessings and more blessings!!!!" and Red Hot Chili Peppers' Flea sent his love in the form of heart emojis. Ashe, meanwhile, couldn't get over the "casual Hans Zimmer cameo."
Melii and Quenlin Blackwell also wished the "bad guy" singer a good one. The rapper reshared Eilish's shots from her latest Billboard cover alongside Interscope Records CEO John Janick and fellow Interscope artists Selena Gomez and DaBaby. "@billieeilish happy birthday baby girl love you !!!and congratulations punk!" she wrote on her IG Story.
Meanwhile, the TikTok star shared a picture of Eilish being completely shocked on her IG Story and wrote, "Happy birthday Billie. I love you with all of my heart and I hope today treats you kindly. We're gonna be 50 on our poarches [sic] in a blink of an eye bra. @billieeilish."