Inside Billie Eilish’s 21st birthday party: See her holiday-inspired, PDA-packed bash ... The Neighbourhood vocalist complemented his girlfriend in a Santa costume with a collared shirt underneath.

Billie Eilish rang in her 21st birthday party with a star-studded party at The Edition in West ... who wore a bright red cardigan over a white button-down shirt to coordinate with his ...

Billie Eilish celebrated her 21st birthday during a star-studded ... Doja Cat, Petra Collins and Noah Cyrus were all spotted at the party ... and celebrated in a custom T-shirt that read ...

Billie Eilish's 21st party was Christmas-themed, ... while beau Jesse matched in a white shirt and red cardigan. ... Billie Eilish's birthday party was complete with a disco ball-filled ceiling.