Coldplay's frontman Chris Martin stopped by one of the Crisis Christmas homeless shelters in London earlier this week and gave an impromptu performance, in which he paid tribute to the late George Michael. 

The charity, Crisis, shared video footage of Martin's performance and accompanied the clip with the following caption: 

"A huge thank you to Coldplay's Chris Martin for dropping by our Crisis at Christmas centres and entertaining our guests! Here he is performing a wonderful tribute to George Michael with our very own King of Karaoke - #CrisisXmas guest Kevin!"

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Watch the video here: