Answer:
She hasn't had anything done, suprisingly seems to be all the rage now with celebrities. No Beyoncé has had nothing done, I know there are some websites out there that will tell you otherwise. Beyoncé is a strong woman, and a great role model. Shes very religious and wouldn't consider altering her appearance, shes also a model for her clothing range, it just wouldn't work, if she had had surgery.
Hope this answers your question :)