If you haven't heard, Britney Spears has been performing shows around the country recently, and they've basically been big disappointments.

The pop "tart" hasn't sung a word and has only lip-synched and danced her way around the stage for about 15 minutes before exiting stage left.

Recently, it was announced that she'd be performing with Cyndi Lauper for her True Colors Tour at its L.A. stop on Saturday.

Well, one source is reporting to Page Six that Britney said she would only dance or lip-sync. Because Cyndi said she'd actually have to perform, Britney's no longer on the bill.

Does this actually surprise anyone?? She hasn't been singing in her live shows ... ever? She and Ashlee Simpson should go do a tour together.