Britney Spears is headlining in Vegas and don't think she isn't going to be on point. The pop diva was spotted at an LA dance studio sweatin' it out on the treadmill. Brit, whose Planet Hollywood show is set to open in December has preemptively sound checked the lip synching controversy by creating a 'cheat sheet' for her minions including such truthiness statements as "Yes! She will be singing live!" and "Certainly she will be singing live!" and of course, "Yes, all vocals will be live!"