Shakira? please elaborate.

I hope you're talking about image with the same nappy curls look since her crossover era. (I am so tired of that look)

Not putting her on a pedestal, but I think Shakira is one of the FEW artists that each of her eras dares to experiment with different world sounds and genres.

Katy hasn't evolved much since TD but it's too early to really judge her on that, and we haven't even gotten the rest of 25 yet so no one should be saying Adele.
Pink definitely hasn't evolved much since I'm Not Dead though.

But in general, EVERY major artist goes through an evolution until they find their comfort zone. It's just that some are content to stay there for the rest of their lives and others keep pushing.

All the fools saying Rihanna need to check that. She has dipped her hands in: pop, urban, hiphop, RnB, and more. She's grown personally and musically. Some of you just love to talk out of your asses.

No they aren't two pop albums. LOUD is heavily influenced by mainstream pop, whereas Unapologetic was rooted more in urban and trap. You might lack the ability to hear the difference, but everyone else clearly does.

Adele

Beyonce (all her albums sound the exact same)
Demi (she's regressing with each album rather than evolving)

If you honestly are suggesting that Bug a Boo and Mine sound even remotely similar, you may want to clean your ears.

Katy hasnt changed since TD. But there was a clear shift from OOTB to TD

BritneyFatale please
Do you seriously believe that BEYONCE sounds anything like B'Day?
Don't let your bitterness towards an artist cloud your judgement.

madonna is the only one who evolves on a daily basis!

Katy Perry, Avril Lavigne

Adele tbh

Nicki Minaj

All except Janet, Madonna, Xtina, and Rihanna.

Pink / beyonce

the pure ignorance. So Born To Die is rock and Ultraviolence is alternative hip hop?

alternative hip hop? sure