Last night in London, Florence Welch of Florence and the Machine
hopped on stage with Mick, Keith and the boys to perform the iconic duet battle "Gimme Shelter."
It's rare to see anyone upstage Jagger's wily hips, but Flo stole it. Next month the Stones are jumping the pond to play the Barclays and Prudential Centers, and if you're lucky (or loaded) enough to have a ticket, we're sure you'll be in for some surprising guest appearances.
As far as fan-footage goes, this kind uploader has the steadiest hand in the West.