Actually Madonna is still the Queen of Pop and Britney is supposed to be the Princess.
But I think the Princess of Pop should be
Christina Aguilera
http://www.bing.com/videos/watch/video/hurt-live-christina-aguilera-koni-favorite/B52201D88771ECC9A2BDB52201D88771ECC9A2BD
(while dancing) http://www.bing.com/videos/watch/video/christina-aguilera-ain-t-no-other-man-live-hd/5161FB9EF1DF91819E435161FB9EF1DF91819E43
or
Lady Gaga
http://www.bing.com/videos/watch/video/lady-gaga-royal-variety-performance-speechless/ED79F00B0D106CFCB585ED79F00B0D106CFCB585
(while dancing) http://www.bing.com/videos/watch/video/lady-gaga-bad-romance-on-ellen-hq/32846DE422A1ECB43BC832846DE422A1ECB43BC8
I think Christina deserves to be on the list of the best female vocalists ever, up there with Etta James (her live cover of Etta's "At Last" http://www.bing.com/videos/watch/video/christina-aguilera-at-last/8AE51D0D9460853D40D88AE51D0D9460853D40D8
is amazing ), Whitney,Aretha,Celine, Mariah, etc. Gaga still has a way to go because she's relatively new and still has to "pay her dues", but,hopefully,someday she could make that list too because i feel she deserves it.
Anyway, I have to admit that Britney is a great dancer/entertainer and her recorded music is pretty catchy, so I do like her. I have all of her CDs and I'll watch her videos. But if I'm going to spend the money to go to a concert, I'd much rather see Christina or Gaga because at least I'd know they're actually singing live.
I wish Britney would always sing live,though. She's not too bad of a live singer
http://www.bing.com/videos/watch/video/15-everytime-britney-spears-showtimemiamioht/67059C34D0FC0C352E7267059C34D0FC0C352E72
http://www.bing.com/videos/watch/video/britney-spears-chante-noel-silent-night/7BC993402316A72348397BC993402316A7234839
She's still no Christina or Gaga, though, but she has an okay voice and even mediocre singing is better than good lip-synching, I think.I wish she could sing live all the time. Then maybe she'd be deserving of her title of the Princess of Pop.
But,otherwise, I think it should go to Christina.