Deciding whether curls are natural or not is difficult to determine from a picture.  It is also a challenge among celebrities who have numerous stylists on their payroll, as well as at their beck and call.  They change hairstyles and color like the average person changes clothes.  Shakira’s hairstyle here appears to be have natural curls as we often see her with her hair in this state.  When your hair is this curly, wearing it at a long length is best.   And there is always the option of utilizing a flatiron.