Naomi is 4+, and she likes Justin Bieber, and of course, she likes taylor swift, Selina Gomez etc... I think it is ok for her to like them but not crazy about them. Some of you might tell me it's too early, but it's just like we adult like Jacky Cheung(ok lar, a bit old but he is coming for concert end of the year mah...), we like westlife, beyonce, we like Akon etc, we don't find ourselves to have any problem with it.
I always taught her to remember Jesus comes first, then family, then other things that she likes. She is a bit more mature probably because I do not pamper her too much. She needs to share housework because she is part of the family and she won't get any reward from there; she sleeps on her own; she likes to keep up with her older cousin whom she think she's cool; and all in all she is just a natural adult. She is sharp, she is observant and she is very detail when it comes to things around her ( not academic learning though). She sees things that i always missed, she could just catch my hint and my tone from the way I talk. She is loving, she is kind, she always give in to her sister that sometimes I feel bad and heartache to see her "sacrifices".
So since she is still doing great and behaving well, I don't see her liking idols would be that big a deal. Parents guidance is important too! She totally understand that those singers are for us to like, not to love, she even told me this "mummy, they are not our family. so we like them, we don't have to love them. " :)