Billie Eilish , 23, posed for a rare family photo alongside her parents and brother at the Avatar: The Last Airbender world premiere in Hollywood on December 2, giving fans an intimate glimpse of the famously private family.

Billie kept her look understated and cool in an oversized olive-green knit sweater with fringe detailing along the hem, layered over a pale blue collared shirt and paired with loose black trousers. She completed the look with sleek straight hair and her signature minimalist glasses.

© Getty Images for 20th Century St (L-R) Maggie Baird, Billie Eilish, Patrick O'Connell, James Cameron and Finneas O'Connell attend the world premiere of 20th Century Studios' "Avatar: Fire and Ash"

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