From the BBC:

Billie Eilish has used her Glastonbury headline set to protest the US Supreme Court's decision to end the constitutional right to abortion.

"Today is a really, really dark day for women in the US," the 20-year-old said from the Pyramid Stage.
"I'm just going to say that because I can't bear to think about it any longer."

She went on to dedicate Your Power, a song about older men who abuse their position, to everyone affected.

And she's bloody good, isn't she?