Charlotte Church has said austerity is "unethical, unfair and unnecessary" as she joined crowds at the front of tpday's march in London.
Brandishing an End Austerity Now placard, she said she was proud to join demonstrators - posing for photos with some.
She said: "I'm here today in a show of solidarity with everyone here - it is a massive turnout - everybody who thinks that austerity isn't the only way and thinks it is essentially unethical, unfair and unnecessary.
"I'm immensely proud to be here. I think this is a brilliant movement and it is for the common good. We are here to make a stand."
The chancellor and the work and pensions secretary have repeated their intention to slash billions as thousands protest against austerity.
Families, students and campaigners from all over the country descended on London for the march, which snaked its way to Parliament.