Which pop princess has matured the most since debuting?

[Cypher]

Pretty self-explanatory poll.

Each person can vote up to 14 singers (15 in total) and then explain!

Don't give me any of this "because she's queen" responses.

I'm not interested in who you like the best, I'm interested in seeing which of these artists actually matured.

Whether that means in their music, personal life, philanthropy, etc.

[Carcunt]

I think Kesha has more than anyone else, really. Half of the people haven't had time to and the other half are about the same.

[Main Pop Girl]

I voted for Britney, Kesha, P!nk and Selena. Britney because she's basically just a super mature, boring version of Rose from The Golden Girls now; Kesha because she's come a long long way from singing songs like 'Tik Tok'; P!nk because she was so young during her first era and she wouldn't be caught dead wearing the clothes or singing the songs from that anymore; and Selena because she's finally ditched 'The Scene', gotten fake boobs and is actually singing slower songs live now.