Not all celebrities completely change their name when they select a pseudonym, of course. "Tick Tock" singer Ke$ha just did away with everything but her first name, added a dollar symbol, and the rest is infectiously catchy pop music history.
Kesha Rose Sebert was the full birth name of this star, who's been absent from the world of music these past few years after a bitter dispute with her record company. Some people initially took the dollar symbol to be obnoxious and vain, but Ke$ha actually meant it to be taken ironically; neither he nor her family had any money when she was growing up, so the idea of her being associated with it was a joke. We're sure she's doing pretty well for herself these days; although it would be nice if someone let her come back and make some new music.