Bono has been busking in Dublin, urging people to donate to a homeless charity.
The U2 frontman was spotted singing with guitarist The Edge in the Irish capital on Christmas Eve .
Money thrown into his empty guitar case was going towards the Simon Community housing charity.
Glen Hansard, who founded Dublin rock band The Frames, organised the Christmas Eve busking event.
He sang a song that criticised the Irish government for its bad handling of homelessness in the country.
After a number of performances from other Irish stars, Bono and The Edge were introduced as "two lads from north Dublin".
They sang a couple of songs, with Bono telling listeners: "As the buckets go around, fill them with silver, fill them with hope – the season of hope."
At the end, he called all the performers together, telling them: "This is very special for us, you should be proud of this."
They were joined by fellow Irish acts Hansard and Imelda May for a rendition of Mariah Carey's Christmas (Baby Please Come Home).
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Almost 10,000 people are homeless in Ireland, according to support group Focus Ireland.
Campaigners say that, despite a strong economy, there are not enough affordable new homes and rents are rising too quickly.