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It turns out Florence and the Machine's Florence Welch is a fan of both Daft Punk and impromptu performances in London bars. 

U.K. cover band Sourberry says Welch hopped on stage during their sound check at the South London Pacific back on July 19th.  She sang-slash-mumbled her way through a cover of Daft Punk's hit single "Get Lucky," downed what was supposedly a tequila shot, and then took on Gossip's "Standing in the Way of Control." 

Welch's antics can be seen in a YouTube video, which has received more than 350-thousand views.