B.o.B, Hayley Williams, Bruno Mars Hit It Off At VMA Rehearsal

The trio start up impromptu sing-alongs during run-through.By Jayson Rodriguez





Hayley Williams and B.o.B perform at their VMA rehearsal on Saturday

Photo: John Shearer/ WireImage




When B.o.B, Bruno Mars and Paramore came together Saturday (September 11) to rehearse their 2010 Video Music Awards performance, the three acts were as relaxed as longtime friends ... it's just that the rehearsal was the first time they all actually met.

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