Britney Spears lip-syncing is not what you'd call a rare event. Here's another example from 2014.
Rating: 5.0 / 5.0
John Krasinski and Jimmy Fallon lip-sync to various pop hits. Pretty great.
Rating: 4.3 / 5.0
Jimmy Fallon and Paul Rudd compete in a lip-sync off. And it's pretty epic.
Rating: 4.0 / 5.0
Katy Perry lip-syncing at the NRJ Music Awards ... check it out!
Rating: 3.6 / 5.0
Iggy caught lip syncing. Note how she doesn't even try to hide it.
Rating: 2.7 / 5.0
Another classic Britney Spears lip sync video. Watch that headset come loose, and yet nothing changes.
Rating: 2.5 / 5.0
Britney Spears lip-syncing in concert, allegedly, as Sia's voice is heard booming in the background.
Rating: Unrated