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LAS VEGAS, NV - AUGUST 20: Britney Spears (L) attends a Back-To-School event benefiting The Nevada Childhood Cancer Foundation at the Zappos Campus in Downtown Las Vegas on August 20, 2015 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)

LAS VEGAS, NV - AUGUST 20:  Britney Spears (L) attends a Back-To-School event benefiting The Nevada Childhood Cancer Foundation at the Zappos Campus in Downtown Las Vegas on August 20, 2015 in Las Vegas, Nevada.  (Photo by Denise Truscello/WireImage)