Billie Eilish shares childhood photo, celebrates 'Best Friend Forever' Finneas on his birthday

Grammy-winning singer Billie Eilish shared a cherished childhood photo with her brother and musical collaborator, Finneas, on the occasion of his birthday.

In a heartwarming Instagram post, the throwback picture captured the adorable moment of baby Billie sleeping while her elder brother Finneas looked at her lovingly.

The Bad Guy singer expressed her deep affection for Finneas in the caption, referring to him as her 'best friend forever.'

She wrote, "my best friend forever. will never love anyone as much as i love you @finneas happy birthday you are the best thing i have."

Fans flooded the comments section with warm wishes and love for Finneas on his birthday.

Billie also shared a cute moment of the duo talking and laughing together, hilariously.

She wrote as a caption, "hahhahaha @finneas i love every second i get to spend with you."

Billie and Finneas have been inseparable throughout their musical journey, crafting chart-topping hits and earning numerous accolades together.