Eilish exited Kendall Jenner's Halloween party with Devon Lee Carlson, who dated Rutherford for six years.
The singer addressed their post-split relationship during an Instagram Q&A with fans.
Billie Eilish and Jesse Rutherford have broken up after less than a year of dating, ET can confirm.
They first sparked dating rumors in October.
The holiday-themed bash took place last week.
Billie Eilish celebrated her 21st birthday over the weekend with a star-studded Christmas-themed bash.
Billie Eilish details her relationship with ex Matthew Tyler Vorce and new boyfriend Jesse Rutherford in a new 'Vanity Fair' interview.
'I locked that motherf**ker down,' Eilish joked in a new video.
The couple made their red carpet debut at 11th Annual LACMA Art + Film Gala Saturday.
Billie Eilish and Jesse Rutherford seemingly call out haters over their 11-year age gap with their Halloween costumes.
Billie Eilish tackled her critics head-on this Halloween.
Billie Eilish was caught kissing her rumored new beau, Jesse Rutherford, lead singer of The Neighbourhood, in Los Angeles on Tuesday.
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