FYI...Janet does not Lip synch. She is actually singing the lead lyrics live. That's partly why she doesn't dance much. She has to sing through the entire show. All performers do that, unless you are Britney Spears (still don't know how she has a career).

PS. She is the reason that other artists (Justin Timberlake, Usher, & etc that toured with her) sing live at their performances. They have support from the background singers and the background vocals of the real track. The lead vocals are the performer singing live.