The singer-songwriter said she plans on switching up her signature ... at PEOPLE. Billie Eilish just shut down the haters who have a problem with her signature neon green hair.

One question she fielded from Colman Domingo asked her to share her favorite hair ... a follow-up from Nicki Minaj, Eilish joked that she'd call her iconic green and black look "The Billie." ...

Billie Eilish has described her classic ... That shade of green was like my colour for so long. I loved it so much. Hair, nails, clothes. It was such a magical period for me, and it was so intense.

Billie Eilish has dyed her ... stories to reveal her latest look, Eilish paired neon-tinted glasses with a green and black bandana to match her new hair style – a natural brown length with ...

Billie Eilish at the 2020 Grammy Awards.