Rarity as Princess

[碇 シンジン 27,433]

To be honest I think rarity is already a princess she doesn't really need the wings or anything else since she has already shown that she is more than capable leader and she is able to make reasonable decisions in tough situations.

 

She also sets good example for ponies to follow and is strong as a character truly a complete package

[BlueStreak98 828]

Princess Rarity would be the most important thing to happen in royal fashion since Lady Diana Spencer.

[Foxy Socks 2,600]

You mean on her own?  Not sure. I honestly don't think she is the princess type. She likes what she is doing and becoming one would interfere with her fasion career.