FYI

"Lady Gaga vows not to ever lipsync in her shows"

An artist doesn't decide whether he lipsync or not. That's agreed between management and venue. Of course artists want to sing live because they get much more credit, but venues always prefer lipsincyng because then there are fewer risks involved and it's much cheaper. So they often don't sign contracts allowing a full live performance. Usually, and this is what most artists do, it's faux live (that's a term i just made up, please correct me i can't remember the proper word!), meaning that most of the show is pre recorded, including instruments and all backing and some main vocals.