There are many pop stars who are nice for fame but are actually nasty behind doors. I'm not going to name drop because I don't want to cause drama. However I will name drop pop stars who were born with a beautiful heart and are still genuinely kind hearted loving people.
Britney Spears - She's always been a sweetheart. You can backstab her and manipulate the public into believing she cheated on you when in reality you had an affair with a female backup dancer and yet Britney still wouldn't trash you and still wish the best for you, your future girlfriend and life in general. Sometimes I think she's TOO nice but thats what makes her beautiful.
Beyonce - She was a bit shady during DC but she's always had an old soul. She's always been nice and seems like the type of person that will save a homeless puppy on a cold rainy day.
Lady Gaga - Doesn't care what skin color, appearance, religion, sexual orientation you are, she'll talk with you. She'll still hug you even if you smell like homeless ass and have rotten teeth.
Shakira - Very intelligent. One of the smartest people out there and just so easy and comfortable to be around with judging by her interviews.
They are all nice but I might say Britney is the nicest but overall they all have a good heart and other pop stars should takes notes in having a heart like them