Christina Aguilera often cooks in her underwear or even naked, according to herself.  Other than that, though, she has learned to dress better.  I can understand why a woman will choose to go without panties in certain dresses (hey, no VPL, though thongs do solve that problem) but then they must learn how to get out of a car without exposing their pussy. 

In this photo you can clearly see that she is not wearing a panty and has Brazilian bikini wax done, like Lindsay Lohan.  I think all these celebs are bad influence on new girls like Hayden Panettiere who are now having their upskirt photos taken.